c - Weird thing with gcc output

Question

So my homework is to write the program that adds every number until 0 is given and then print out the total.

My code is:

#include <stdio.h>

int main(void){
    int sum=0, i;
    do {
        printf("%s", "Enter a number: ");
        scanf(" %d", &i);
        sum +=i;        
}
    while (i!=0);
    printf("%d", sum);
    getchar();
    return 0;
}

Output:

>>Enter a number: 4
4
>>5
Press Enter or type command to continue

But it is supposed to be:

>>Enter a number: 4
>>Enter a number: 5
>>Enter a number: 9
>>Enter a number: 0
18

Can anyone help me with this problem? Thanks in advance.

question from:https://stackoverflow.com/questions/65922626/weird-thing-with-gcc-output

Answer 1

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