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Q1. Print 1 to N

Print numbers from 1 to N using a for loop. 
#include <stdio.h>

int main() {
    int n;
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) {
        printf("%d\n", i);
    }
    return 0;
}

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Q2. Multiplication Table

Print the multiplication table of a given number. 
#include <stdio.h>

int main() {
    int n;
    scanf("%d", &n);
    for (int i = 1; i <= 10; i++) {
        printf("%d x %d = %d\n", n, i, n * i);
    }
    return 0;
}

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Q3. Sum of Digits

Find the sum of digits of a number using a while loop. 
#include <stdio.h>

int main() {
    int n, sum = 0;
    scanf("%d", &n);
    while (n > 0) {
        sum += n % 10;
        n /= 10;
    }
    printf("Sum = %d\n", sum);
    return 0;
}