What is error in the following code?

Question

#include <stdio.h>

int cube (int num);

int (main) {
int x, result;
x=3;
result = cube (x) ;
printf("%d cubed is %d\n",x,result);
return 0;

}

int cube (int num){

int y;

y = num*num*num;

return(y);
}

Answer 1

int main()

return y;