C Control Statements: For Loop Codes

1. 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;
}

2. 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;
}

3. 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;
}

4. 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;
}

5. 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;
}

6. 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;
}

7. 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;
}

8. 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;
}

9. 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;
}

10. 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;
}

11. 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;
}

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