#include <stdio.h>

const int M=99999999;
bool fun(int a,int b);

int main(){
    int N;
    scanf("%d",&N);
    int i;
    int Q=1;
    for(i=0;i<M;i++){
                     if(fun(i,N)==1){
                                     printf("%d",i);
                                     break;
                                     }
                     if(i==M-1){ printf("%d",-1);
                      break;}
            }


}


bool fun(int a,int b){
     int sum=1;
     while(a){
              sum*=a%10;
              a/=10;
              }
     if(sum==b) return 1;
     else return 0;
     }


why I get compil.error?

in Dev-C++ it works :(

Bool is not included in the standard C99.
You need to change "bool" in "int".