how to compare two variable like one one is from file and one is during run time of program.i m making a project using file in c

Question

my issue is that i want to compare two vairables.
1 is i am entering during run time of prog and another is stored in a file.
its a part of my project using files

Answer 1

reading from a file named "a":

#include <fstream>
using namespace std;

int main(){
ifstream fl("./a");
int var;
fl>>var;
fl.close();
return 0;
}