C Language: Is it possible to put "yes" in do while loop?

Question

Is putting "yes" in do while loop statement possible because I cannot figure out how. It's not working.

#include <stdio.h>
int main ()
{
    char choice [3];

    do 
    {
    
    printf ("Do you want to try again? ");
    scanf ("%s", &choice);
    
    } while (choice == "yes");

}

Answer 1

The string "yes" contains 4 characters including the terminating zero character '\0'. So the character array that will accept the string shall be declared at least with 4 elements

char choice[4];

In this call of scanf

scanf ("%s", &choice);

the second argument has the type char( * )[3] (or char ( * )[4] if you will update the array declaration as shown above) instead of char *.

You should write at least like

scanf ("%3s", choice);

In the condition of the do-while statement

while (choice == "yes");

there are compared two pointers due to implicit conversions of the arrays to pointers to their first elements. So the condition will always evaluate to false because the array choice and the string literal "yes" occupy different extents of memory.

You need to use standard C function strcmp declared in the header <string.h> as for example

#include <string.h>

//...

} while ( strcmp( choice, "yes" ) == 0 );