C-Control Statement Codes (52 Questions Solved)
1.Write a program to find the given number is positive or negative
#include <stdio.h>
int main() {
int a;
printf("Enter the number, a: ");
scanf("%d", &a);
if (a > 0) {
printf("Positive Number");
} else {
printf("Negative Number");
}
return 0;
}
2. Write a program to find the given number is odd or even
#include <stdio.h>
int main() {
int a, R;
printf("Enter the number, a: ");
scanf("%d", &a);
R = a % 2;
if (R == 0) {
printf("Even Number");
} else {
printf("Odd Number");
}
return 0;
}
3. WAP to read a number from the user and whether a given number is prime or composite.
#include <stdio.h>
int main() {
int n, i = 2;
printf("Enter the number: ");
scanf("%d", &n);
while (i < n) {
if (n % i == 0) {
printf("Composite Number");
break;
}
i++;
}
if (i == n)
printf("Prime Number");
return 0;
}
4. Write a program to check whether a first number is divisible by second or not
#include <stdio.h>
int main() {
int a, b, R;
printf("Enter the two numbers: ");
scanf("%d%d", &a, &b);
R = a % b;
if (R == 0) {
printf("The first number %d is divisible by the second %d", a, b);
} else {
printf("The first number %d is not divisible by the second %d", a, b);
}
return 0;
}
5. Write a program to find the given number is exactly divisible by 3 or not
#include <stdio.h>
int main() {
int a, R;
printf("Enter the number, a: ");
scanf("%d", &a);
R = a % 3;
if (R == 0) {
printf("Divisible by 3");
} else {
printf("Not divisible by 3");
}
return 0;
}
6. WAP a program to read a number from keyboard and test whether the number is exactly divisible by 3 but not by 11 or not.
#include <stdio.h>
int main() {
int a;
printf("Enter the number, a: ");
scanf("%d", &a);
if (a % 3 == 0 && a % 11 != 0) {
printf("Divisible by 3 but not divisible by 11");
} else {
printf("Not divisible by 3 or divisible by 11");
}
return 0;
}
7. Write a program to find the greatest among three numbers using nested if… else
statement
#include <stdio.h>
int main() {
int a, b, c;
printf("Enter the numbers: ");
scanf("%d%d%d", &a, &b, &c);
if (a > c && a > b) {
printf("Greatest is %d", a);
} else if (b > a && b > c) {
printf("Greatest is %d", b);
} else {
printf("Greatest is %d", c);
}
return 0;
}
8. Write a program to find the greatest among three numbers using nested if... else if statement
#include <stdio.h>
int main() {
int a, b, c;
printf("Enter the numbers: ");
scanf("%d%d%d", &a, &b, &c);
if (a > b) {
if (a > c) {
printf("Greatest number is %d", a);
} else {
printf("Greatest number is %d", c);
}
} else {
if (b > c) {
printf("Greatest number is %d", b);
} else {
printf("Greatest number is %d", c);
}
}
return 0;
}
9. Write a program to find the greatest among four numbers
#include <stdio.h>
int main() {
int a, b, c, d;
printf("Enter the numbers: ");
scanf("%d%d%d%d", &a, &b, &c, &d);
if (a > b && a > c && a > d) {
printf("Greatest is %d", a);
} else if (b > a && b > c && b > d) {
printf("Greatest is %d", b);
} else if (c > a && c > b && c > d) {
printf("Greatest is %d", c);
} else {
printf("Greatest is %d", d);
}
return 0;
}
10. Write a program to find the second largest number among three numbers
#include <stdio.h>
int main() {
int a, b, c;
printf("Enter the numbers: ");
scanf("%d%d%d", &a, &b, &c);
if ((a > b && a < c) || (a > c && a < b)) {
printf("Second largest is %d", a);
} else if ((b > a && b < c) || (b > c && b < a)) {
printf("Second largest is %d", b);
} else {
printf("Second largest is %d", c);
}
return 0;
}
11. Write a program to convert uppercase to lowercase and lowercase to uppercase
#include <stdio.h>
int main() {
char ch;
printf("Enter the desired character, ch: ");
scanf("%c", &ch);
if (ch >= 65 && ch <= 90) {
printf("The character is uppercase\n");
ch = ch + 32;
printf("Lowercase character is %c", ch);
} else if (ch >= 97 && ch <= 122) {
printf("Character is lowercase\n");
ch = ch - 32;
printf("Uppercase character is %c", ch);
} else {
printf("Invalid character");
}
return 0;
}
12. Write a program to find whether the given number is loop year or not
#include <stdio.h>
int main() {
int year;
printf("Enter the year: ");
scanf("%d", &year);
if (year % 4 == 0 && year % 100 != 0) {
printf("Leap year");
} else if (year % 400 == 0) {
printf("Leap year");
} else {
printf("Not a leap year");
}
return 0;
}
13. Write a program to find all the roots of quadratic equation
#include <stdio.h>
#include <math.h>
int main() {
float a, b, c, D, R1, R2, R, I;
printf("Enter the value of a, b, c: ");
scanf("%f%f%f", &a, &b, &c);
D = b * b - 4 * a * c;
if (D == 0) {
R1 = -b / (2 * a);
printf("The roots are real and equal = %f, %f", R1, R1);
} else if (D > 0) {
R1 = (-b + sqrt(D)) / (2 * a);
R2 = (-b - sqrt(D)) / (2 * a);
printf("The roots are real and unequal = %f, %f", R1, R2);
} else {
R = -b / (2 * a);
I = sqrt(-D) / (2 * a);
printf("The roots are imaginary = %.2f+%.2fi, %.2f-%.2fi", R, I, R, I);
}
return 0;
}
14. Write a program to check three sides of a triangle and check the validity of the triangle as well as display if it is scalene, isosceles, equivalent or right-angled triangle.
#include <stdio.h>
int main() {
int a, b, c;
printf("Enter the three sides of the triangle: ");
scanf("%d%d%d", &a, &b, &c);
if (a <= 0 || b <= 0 || c <= 0 || (a + b <= c) || (a + c <= b) || (b + c <= a)) {
printf("Invalid triangle");
} else {
if (a == b && b == c) {
printf("It is an equilateral triangle.");
} else if (a == b || b == c || a == c) {
printf("It is an isosceles triangle.");
} else {
printf("It is a scalene triangle.");
}
if ((a * a + b * b == c * c) || (a * a + c * c == b * b) || (b * b + c * c == a * a)) {
printf(" The triangle is a right-angled triangle.");
}
}
return 0;
}
15. The monthly electricity bill is to calculated as: a) Minimum Rs. 80 for up to 20 units. b) Rs. 7.30 per unit for next 100 units. c) Rs. 9.00 per unit for any units beyond 120 units. Write a program to calculate the monthly bill for a given number of units consumed by a customer.
#include <stdio.h>
int main() {
float unit, Price;
printf("Enter the consumed unit: ");
scanf("%f", &unit);
if (unit <= 20) {
printf("The price is Rs.80");
} else if (unit <= 100 && unit > 20) {
Price = 80 + (unit - 20) * 7.3;
printf("The price is Rs.%.2f", Price);
} else {
Price = 80 + (unit - 20) * 9.0;
printf("The price is Rs.%.2f", Price);
}
return 0;
}
16. Write a program to find the arithmetic operation using the switch statement
#include <stdio.h>
int main() {
float a, b, R;
char x;
printf("Enter the numbers: ");
scanf("%f%f", &a, &b);
printf("Enter the operation (+, -, *, /): ");
scanf(" %c", &x);
switch (x) {
case '+':
R = a + b;
printf("The sum is %.2f", R);
break;
case '-':
R = a - b;
printf("The difference is %.2f", R);
break;
case '*':
R = a * b;
printf("The product is %.2f", R);
break;
case '/':
if (b != 0) {
R = a / b;
printf("The division is %.2f", R);
} else {
printf("Error: Division by zero");
}
break;
default:
printf("Invalid input");
}
return 0;
}
17. Write a program to print the names of the days using switch statement. Our output must show Sunday if the user enters 1 and so on.
#include <stdio.h>
int main() {
int num;
printf("Enter the number: ");
scanf("%d", &num);
switch (num) {
case 1:
printf("Sunday");
break;
case 2:
printf("Monday");
break;
case 3:
printf("Tuesday");
break;
case 4:
printf("Wednesday");
break;
case 5:
printf("Thursday");
break;
case 6:
printf("Friday");
break;
case 7:
printf("Saturday");
break;
default:
printf("Invalid input");
}
return 0;
}
18. Write a program to display whether the entered charactered by the user is either vowel, consonant or digits using switch statement.
#include <stdio.h>
int main() {
char a;
printf("Enter the alphabet or digit: ");
scanf(" %c", &a);
switch (a) {
case 'a':
case 'e':
case 'i':
case 'o':
case 'u':
printf("It is a vowel");
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
printf("It is a digit");
break;
default:
printf("It is a consonant");
}
return 0;
}
19. Write a program to check whether a input character is vowel or consonant
#include <stdio.h>
int main() {
char x;
printf("Enter the character: ");
scanf("%c", &x);
if (x == 'a' || x == 'e' || x == 'i' || x == 'o' || x == 'u') {
printf("The entered character is a vowel");
} else {
printf("The entered character is a consonant");
}
return 0;
}
20. Write a program to find whether the given number is odd or even using switch statement
#include <stdio.h>
int main() {
int a, R;
printf("Enter the number: ");
scanf("%d", &a);
R = a % 2;
switch (R) {
case 0:
printf("The number is even");
break;
default:
printf("The number is odd");
}
return 0;
}
21. Write a program to check whether a given number is prime or composite using switch statement
#include <stdio.h>
int main() {
int n, i = 2;
printf("Enter the number: ");
scanf("%d", &n);
switch (n) {
case 0:
case 1:
printf("Not a Prime Number");
break;
case 2:
printf("Prime Number");
break;
default:
while (i < n) {
if (n % i == 0) {
printf("Composite Number");
break;
}
i++;
}
if (i == n) {
printf("Prime Number");
}
break;
}
return 0;
}
22. Write a program to input digit decimal number and display its digits in words using switch statement.
#include <stdio.h>
int main() {
int n, R, reverse = 0;
printf("Enter a decimal number: ");
scanf("%d", &n);
printf("Digits in words: ");
if (n == 0) {
printf("Zero");
return 0;
}
// Reverse the number
do {
R = n % 10;
reverse = reverse * 10 + R;
n = n / 10;
} while (n != 0);
// Print digits in words
while (reverse != 0) {
R = reverse % 10;
reverse = reverse / 10;
switch (R) {
case 0:
printf("Zero ");
break;
case 1:
printf("One ");
break;
case 2:
printf("Two ");
break;
case 3:
printf("Three ");
break;
case 4:
printf("Four ");
break;
case 5:
printf("Five ");
break;
case 6:
printf("Six ");
break;
case 7:
printf("Seven ");
break;
case 8:
printf("Eight ");
break;
case 9:
printf("Nine ");
break;
default:
printf("Invalid Number ");
}
}
printf("\n");
return 0;
}
23. Write a program to read two numbers from the user (n1<n2) and display the natural numbers between them
#include <stdio.h>
int main() {
int n1, n2, i = 1;
printf("Enter the two numbers: ");
scanf("%d%d", &n1, &n2);
while (i <= (n2 - n1 - 1)) {
printf("The numbers in between %d and %d are %d\n", n1, n2, n1 + i);
i++;
}
return 0;
}
24. Write a program to read two numbers from the user (n1<n2) and display the numbers which are divisible by 5
#include <stdio.h>
int main() {
int n1, n2, i = 1;
printf("Enter the two numbers: ");
scanf("%d%d", &n1, &n2);
while (i <= (n2 - n1)) {
if ((n1 + i) % 5 == 0) {
printf("The numbers in between %d and %d that are divisible by 5 are %d\n", n1, n2, n1 + i);
}
i++;
}
return 0;
}
25. Write a program to find the factorial of a given number
#include <stdio.h>
int main() {
int n, i;
long fact = 1;
printf("Enter the number: ");
scanf("%d", &n);
for (i = 1; i <= n; i++) {
fact = fact * i;
}
printf("The factorial of %d is %ld", n, fact);
return 0;
}
26. Write a program to find the sum of first n natural number
#include <stdio.h>
int main() {
int n, sum = 0, i;
printf("Enter the number: ");
scanf("%d", &n);
for (i = 1; i <= n; i++) {
sum = sum + i;
}
printf("The sum of natural numbers up to %d = %d", n, sum);
return 0;
}
27. WAP to print the ASCII values of all characters.
#include <stdio.h>
int main() {
int i;
printf("ASCII values of all characters:\n");
for (i = 0; i <= 127; i++) {
printf("Character: %c, ASCII Value: %d\n", i, i);
}
return 0;
}
28. Write a program to display the series: 1/2 2/3 3/4 4/5 … (n-1)/n
#include <stdio.h>
int main() {
int i = 1, n;
printf("Enter the number: ");
scanf("%d", &n);
while (i <= n) {
printf("%d/%d\t", i, i + 1);
i++;
}
return 0;
}
29. WAP to evaluate the series: S = 1 + 2 x 1 + 3 x 2 + … N x N-1 up to N terms
#include <stdio.h>
int main() {
int i = 1, n, sum = 1;
printf("Enter the number of terms (n): ");
scanf("%d", &n);
while (i <= n) {
sum = sum + i * (i - 1);
i++;
}
printf("The sum of the series 1 + 2 x 1 + 3 x 2 + … N x (N-1) up to N terms is %d", sum);
return 0;
}
30. Write a program to read two numbers and find and display the sum. The program must ask next two numbers and add until user wants.
#include <stdio.h>
int main() {
int a, b, sum;
char i = 'y';
while (i == 'y' || i == 'Y') {
printf("Enter the two numbers: ");
scanf("%d%d", &a, &b);
sum = a + b;
printf("The sum is %d\n", sum);
printf("Do you want to add more? If yes, press y: ");
scanf(" %c", &i);
}
return 0;
}
31. Write a program to read a number from the user until a zero or negative number is keyed in. Finally calculate the sum and average of entered numbers.
#include <stdio.h>
int main() {
int n, count = 0, sum = 0;
printf("Enter numbers and enter zero or a negative number to stop:\n");
while (1) {
printf("Enter a number: ");
scanf("%d", &n);
if (n <= 0) {
break;
}
sum = sum + n;
count++;
}
if (count > 0) {
float average = (float)sum / count;
printf("Sum of entered numbers: %d\n", sum);
printf("Average of entered numbers: %.2f\n", average);
} else {
printf("No valid numbers were entered.\n");
}
return 0;
}
32. Write a program to find the multiplication table a given number using for loop
#include <stdio.h>
int main() {
int n, i;
printf("Enter the number: ");
scanf("%d", &n);
for (i = 1; i <= 10; i++) {
printf("%d x %d = %d\n", n, i, n * i);
}
return 0;
}
33. Write a program to display the multiplication table from 5-10.
#include <stdio.h>
int main() {
int i, j;
for (j = 5; j <= 10; j++) {
for (i = 1; i <= 10; i++) {
printf("%d x %d = %d ", j, i, j * i);
}
printf("\n");
}
return 0;
}
34. Write a program to count the number of digits in a given integer number.
#include <stdio.h>
int main() {
long long n;
int count = 0;
printf("Enter the number: ");
scanf("%lld", &n);
if (n == 0) {
count = 1;
} else {
while (n != 0) {
n = n / 10;
count++;
}
}
printf("Number of digits are %d\n", count);
return 0;
}
35. Write a program to find the sum of the digits of a given integer number.
#include <stdio.h>
int main() {
long n;
int sum = 0, R;
printf("Enter the number: ");
scanf("%ld", &n);
while (n != 0) {
R = n % 10;
sum = sum + R;
n = n / 10;
}
printf("The sum of digits is %d", sum);
return 0;
}
36. Write a program to find the reverse of the given positive number
#include <stdio.h>
int main() {
long n, result = 0;
int R;
printf("Enter the positive number: ");
scanf("%ld", &n);
do {
R = n % 10;
result = result * 10 + R;
n = n / 10;
} while (n != 0);
printf("The reversed number is %ld", result);
return 0;
}
37. Write a program to check whether a given number is Palindrome or not
#include <stdio.h>
int main() {
long n, num, result = 0;
int remainder;
printf("Enter the number: ");
scanf("%ld", &num);
n = num;
do {
remainder = num % 10;
result = result * 10 + remainder;
num = num / 10;
} while (num != 0);
if (n == result) {
printf("The number is a palindrome");
} else {
printf("The number is not a palindrome");
}
return 0;
}
38. Write a program to check whether the given number is Armstrong or not
#include <stdio.h>
int main() {
int n, R, num, result = 0;
printf("Enter the number: ");
scanf("%d", &n);
num = n;
while (n != 0) {
R = n % 10;
result = result + R * R * R;
n = n / 10;
}
if (result == num) {
printf("Entered number is an Armstrong number");
} else {
printf("Not an Armstrong Number");
}
return 0;
}
39. WAP to check whether a given number is strong or not.
#include <stdio.h>
int main() {
int n, sum = 0, num, R, i, fact;
printf("Enter the number: ");
scanf("%d", &n);
num = n;
while (n != 0) {
R = n % 10;
fact = 1;
for (i = 1; i <= R; i++) {
fact = fact * i;
}
sum = sum + fact;
n = n / 10;
}
if (sum == num) {
printf("Strong Number");
} else {
printf("Not a Strong Number");
}
return 0;
}
40. Write a program to check whether a given number is Perfect or not.
#include <stdio.h>
int main() {
int n, R, i, sum = 0;
printf("Enter the number: ");
scanf("%d", &n);
for (i = 1; i < n; i++) {
R = n % i;
if (R == 0) {
sum = sum + i;
}
}
if (sum == n) {
printf("Perfect Number");
} else {
printf("Not a Perfect Number");
}
return 0;
}
41. Write a program to find the perfect numbers between entered two numbers.
#include <stdio.h>
int main() {
int n1, n2, sum, i, n;
printf("Enter the two numbers: ");
scanf("%d%d", &n1, &n2);
printf("The perfect numbers between %d and %d are:\n", n1, n2);
for (n = n1; n <= n2; n++) {
sum = 0;
for (i = 1; i < n; i++) {
if (n % i == 0) {
sum = sum + i;
}
}
if (sum == n) {
printf("%d\t", n);
}
}
return 0;
}
42. Write a program to find the Armstrong numbers between given two ranged numbers
#include <stdio.h>
int main() {
int n1, n2, result, num, R, i;
printf("Enter the two numbers: ");
scanf("%d%d", &n1, &n2);
printf("Armstrong numbers between %d and %d are:\n", n1, n2);
for (i = n1; i <= n2; i++) {
result = 0;
num = i;
while (num != 0) {
R = num % 10;
result = result + R * R * R;
num = num / 10;
}
if (result == i) {
printf("%d\t", i);
}
}
return 0;
}
43. Write a program to generate the Fibonacci series of n terms enter by user using loop
#include <stdio.h>
int main() {
int i, n, first = 0, second = 1, next;
printf("Enter the number of terms: ");
scanf("%d", &n);
for (i = 0; i < n; i++) {
if (i <= 1) {
next = i;
} else {
next = first + second;
first = second;
second = next;
}
printf("%d ", next);
}
return 0;
}
44. Write a program to check whether an entered number is the term of Fibonacci Series or not.
#include <stdio.h>
int main() {
int i, n, first = 0, second = 1, next;
printf("Enter the number: ");
scanf("%d", &n);
while (second < n) {
next = first + second;
first = second;
second = next;
}
if (second == n) {
printf("It is a term of the Fibonacci series");
} else {
printf("It is not a term of the Fibonacci series");
}
return 0;
}
45. Write a program to find the HCF (GCD) and LCM of given two numbers.
#include <stdio.h>
int main() {
int a, b, c, d, hcf, lcm, temp;
printf("Enter the two numbers: ");
scanf("%d%d", &a, &b);
c = a;
d = b;
while (b != 0) {
temp = b;
b = a % b;
a = temp;
}
hcf = a;
lcm = (c * d) / hcf;
printf("HCF and LCM of %d and %d are %d and %d\n", c, d, hcf, lcm);
return 0;
}
46. Write a program to read two integers and display both the even numbers and odd numbers between those numbers separately. Also display the number of frequencies of both even and odd numbers
#include <stdio.h>
int main() {
int a, b, Ocount = 0, Ecount = 0, i;
printf("Enter the two numbers: ");
scanf("%d%d", &a, &b);
printf("Even numbers between %d and %d are:\n", a, b);
for (i = a; i <= b; i++) {
if (i % 2 == 0) {
printf("%d\t", i);
Ecount = Ecount + 1;
}
}
printf("\nOdd numbers between %d and %d are:\n", a, b);
for (i = a; i <= b; i++) {
if (i % 2 != 0) {
printf("%d\t", i);
Ocount = Ocount + 1;
}
}
printf("\nThe number of odd and even numbers between %d and %d are %d and %d\n", a, b, Ocount, Ecount);
return 0;
}
47. Write a program to find the cubes and squares of first 10 natural numbers
#include <stdio.h>
int main() {
int i = 1;
while (i <= 10) {
printf("The square and cube of %d are %d and %d\n", i, i * i, i * i * i);
i++;
}
return 0;
}
48. Write a program to find the mean and standard deviation for the given set of numbers
#include <stdio.h>
#include <math.h>
int main() {
int n, i;
float sum = 0, mean, variance = 0, std;
printf("Enter the number of data: ");
scanf("%d", &n);
float num[n];
printf("Enter %d numbers:\n", n);
for (i = 0; i < n; i++) {
scanf("%f", &num[i]);
sum = sum + num[i];
}
mean = sum / n;
for (i = 0; i < n; i++) {
variance += pow(num[i] - mean, 2);
}
variance /= n;
std = sqrt(variance);
printf("Mean is %.2f\n", mean);
printf("Standard Deviation is %.2f\n", std);
return 0;
}
49. Write a program to find out the sum of Arithmetic Series
#include <stdio.h>
int main() {
int a, d, sum, n;
printf("Enter the first term, difference, and number of terms of the series (a, d, n): ");
scanf("%d%d%d", &a, &d, &n);
sum = (n / 2) * (2 * a + (n - 1) * d);
printf("The sum of the given arithmetic series is %d\n", sum);
return 0;
}
50. Write a program to find out the sum of Geometric Series.
#include <stdio.h>
#include <math.h>
int main() {
float a, r, sum;
int n;
printf("Enter the first term, common ratio, and number of terms (a, r, n): ");
scanf("%f%f%d", &a, &r, &n);
sum = (a * (1 - pow(r, n))) / (1 - r);
printf("The sum of the given geometric series is %.2f\n", sum);
return 0;
}
51. Write a program to convert decimal number into binary number
#include <stdio.h>
int main() {
long int deci, bin, R, Div, i = 1, sum = 0;
printf("Enter the decimal number: ");
scanf("%ld", &deci);
do {
Div = deci / 2;
R = deci % 2;
deci = Div;
sum = sum + R * i;
i = i * 10;
} while (Div != 0);
printf("The binary number is %ld\n", sum);
return 0;
}
52. Write a program to convert binary number into decimal number
#include <stdio.h>
int main() {
long int bin, Div, R, i = 1, sum = 0;
printf("Enter the binary number: ");
scanf("%ld", &bin);
do {
Div = bin / 10;
R = bin % 10;
bin = Div;
sum = sum + R * i;
i = i * 2;
} while (Div != 0);
printf("The decimal number is %ld\n", sum);
return 0;
}
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