Why my program c is incorrect

Question

#include<stdio.h>

main(){
Printf(Hello world);
}

Answer 1

#include <stdio.h>

int main() {
printf("Hello World");
return 0;
}

Function main must have return value and string should be in quotation marks because compiler will think that it is a variable and give you error that variable wasn't declare

Answer 2

Kids can code

String should be inside double quotes and also main method should have return type.