求补齐空白两处，一直错求解答

#include
void main( )
{ a=7;
float x=2.5,y=4.7 ;
z ;
z= x + a % 3 * (int) (x + y) % 2 / 4;
printf("z=%f\n",z);
}

#include <stdio.h>

void  main( ) {
    int a = 7;
    float x = 2.5, y = 4.7 ;
    float z ;
    z = x + a % 3 * (int) (x + y) % 2 / 4;
    printf("z=%f\n", z);
}