How to put an if condition with string input?

Question

#include <stdio.h>

int main() {
char s[20];
scanf("%s",s);
if(s=="question")
{
printf("answer");
}
return 0;
}

I don't understand why it doesn't work. Please help. Thanks

Answer 1

First:

#include <string.h>

You use strcmp from there.

if(!strcmp(s, "question"))
....

strcmp returns 0 if the strings are equal, that's why 'not' (!).

Answer 2

String comparison in C is done by the use of strcmp function, which means you need to include <string.h> header.

Reference:
http://www.cplusplus.com/reference/cstring/strcmp/