View Code of Problem 120

# include<stdio.h>
# include<math.h>
bool isPrime(int n){
	bool flag=true;
	for(int i=2;i<=sqrt(n);i++){
		if(n%i==0){
			flag=false;
			break;
		}
	}
	return flag;
}
int main(){
	int h1,m1,h2,m2,t1,t2,count;
	while(scanf("%d:%d %d:%d",&h1,&m1,&h2,&m2)!=EOF){
		t1=h1*2500+m1;
		t2=h2*2500+m2;
		count=0;
		for(int i=t1;i<=t2;i++){
			if(i==0||i==1){
				continue;
			}
			if(isPrime(i)){
				count++;
			}
		}
		printf("%d",count);
	}
	return 0;
} 
/*
Main.c:3:1: error: unknown type name 'bool'
 bool isPrime(int n){
 ^
Main.c: In function 'isPrime':
Main.c:4:2: error: unknown type name 'bool'
  bool flag=true;
  ^
Main.c:4:12: error: 'true' undeclared (first use in this function)
  bool flag=true;
            ^
Main.c:4:12: note: each undeclared identifier is reported only once for each function it appears in
Main.c:7:9: error: 'false' undeclared (first use in this function)
    flag=false;
         ^
*/