ifndef c++ code example

Example 1: header ifndef

#ifndef HEADERFILE_H
#define HEADERFILE_H

#endif

Example 2: C++ if else

#include<iostream>
using namespace std;

int main()
{
    int grade;

    cin >> grade;

    if( grade >= 60 )
        cout << "You Pass!" << endl;
    else
        cout << "You Fail..." << endl;

    return 0;
}

Example 3: if c++

int x = 20;
int y = 18;
if (x > y) {
  cout << "x is greater than y";
}

Example 4: C++ if else

#include<iostream>
using namespace std;

int main()
{
    int grade;

    cin >> grade;

    if( grade >= 60 )
    {
        cout << "You Pass!" << endl;
    }
    else
    {
        cout << "You Fail..." << endl;
    }

    return 0;
}

Example 5: if c++

#include<iostream>
using namespace std;
int main(){
	int eta; 
	cout<<"Ciao Utente inserisci la tua eta'! "<<"\n";
	cin>>eta;
	if(eta >= 18){
		cout<<"Benvenuto al cinema!";
	}
}