Question

Create a program that asks the user to input three numbers and computes their sum. This sounds simple, but there's a constraint. You should only use two variables and use combined statements. You can use the output below as a guide. Please enter the first number: 4 Please enter the second number: 2 Please enter the third number: 9 The sum of the three numbers is: 15.

Answer 1

#include <stdio.h>

int main() {
    int n1, n2, n3;
    /**
     * printf is used to print stuff onto the screen
     * scanf is used to read values/numbers from the user
     */
    printf("Please enter the first number: ");  // ask user to enter first number
    scanf("%d", &n1);   // read first number into variable n1
    printf("Please enter the second number: ");  // ask user to enter second number
    scanf("%d", &n2);   // read second number into variable n2
    printf("Please enter the third number: ");  // ask user to enter third number
    scanf("%d", &n3);   // read third number into variable n3
    printf("The sum of the three numbers is: %d.\n", n1+n2+n3); // calculate the sum and display the sum to the user
    return 0;
}