Help me in solving PPSC18 problem

help
,
1

My issue

Why am I getting error and what is the correct code for it?

My code

#include <stdio.h>
#include <stdbool.h>

int main(void) {
    bool x = true;
    bool y = false;
    printf("%s\n%s", x ? "true" : "false", y ? "true" : "false");
}

Learning course: CSEIPFOIA: Programming and Problem Solving
Problem Link: Bool Datatype Practice Problem in CSEIPFOIA: Programming and Problem Solving - CodeChef