What's problem in this program?

Question

#include <iostream>
using namespace std;

int main() {
int marks;
if (marks>=50);
{
cout<<"add 10 percent";
}
else
{
cout<<"fail";
}

return 0;
}

Answer 1

Did you take input? marks

and semicolon should not be after if block

Answer 2

on line 6 : you used a semicolon which cause error , cuz in if/else statement we use '{}' not ';'