Tutoring: sample of various ways to use bool in C++

boolean.cpp

#include <iostream>
using namespace std;

bool foobar(int f){
  return (f==7);
}

int main(){

  bool foobarcondition=foobar(7);
  if(foobarcondition){
    cout<<"Foobar equals 7"<<endl; // this is printed
  }
  
  bool condition = false;
  if(condition){
    cout<<"Condition is true"; // this is NOT printed
  }
  
  int i=5;
  bool expression = (i == 5);
  
  if(expression){
    cout<<"The expression is true"<<endl; //this is printed
  }
  else{
    cout<<"the expression is false"<<endl;
  }
  
  return 0;
}