c++ ödev acil yardım

#include<iostream>
#include<cstdlib>
#include<time.h>
using namespace std;


int main (){

int  operation;
int x,y,answer;

for(int i=1;i<5;i++){


srand(time(NULL));

operation=rand()%4+1;
x=rand()%10+1;
y=rand()%10+1;



switch(operation)

{
	case 1: 
	cout<<x<<'+'<<y<<'=';
	cin>>answer;
	if(x+y==answer){
	}
	
	break;
	case 2:
	cout<<x<<'-'<<y<<'=';
	cin>>answer;
	if(x+y==answer){
}
		case 3:
			cout<<x<<'*'<<y<<'=';
			cin>>answer;
			if(x+y==answer){
}
			break;
			case 4:
				cout<<x<<'/'<<y<<'=';
				cin>>answer;
				if(x+y==answer){
}
				break;
}
}

return 0;
}