Question

In this example you are allowed to use from the C standard library only functions for input and output (e.g. printf(), scanf())

Complete the following functions using C programming language:

• intQ1_for()
• intQ1_while()
• intQ1_do()

To compute the sum of all numbers that are multiples of 4, between 30 and 1000, in 3 different ways: with a for loop, a while loop and a do-while loop, accordingly. After each loop print the value. Return the total sum at the end of each function

Answer 1

#include <stdio.h>

int intQ1_for(){
    int result = 0, i;
    for(i = 30;i<=1000;i++){
        if(i%4==0){
            result += i;
        }
    }
    return result;
}

int intQ1_while(){
    int result = 0, i;
    i = 30;
    while(i<=1000){
        if(i%4==0){
            result += i;
        }
        i++;
    }
    return result;
}

int intQ1_do(){
    int result = 0, i;
    i = 30;
    do{
        if(i%4==0){
            result += i;
        }
        i++;
    }while(i<=1000);
    return result;
}


int main()
{
    printf("Using for loop: %d\n",intQ1_for());
    printf("Using while loop: %d\n",intQ1_while());
    printf("Using do loop: %d\n",intQ1_do());
    
    return 0;
}