C++ if-else Statements

If else statements in C++ is also used to control the program flow based on some condition, only the difference is: it's used to execute some statement code block if the expression is evaluated to true, otherwise executes else statement code block.

The basic format of if else statement is:

if(test_expression)
{
   //execute your code
}
else
{
   //execute your code
}

Figure - Flowchart of if-else Statement:

Example of a C++ Program to Demonstrate if-else Statement

#include <iostream>
using namespace std;

int main()
{
  int a = 15, b = 20;

  if (b > a) {  
    cout << "b is greater" << endl;
  } else {  
    cout << "a is greater" << endl;
  }  
  system("PAUSE");
}

#include <iostream>
using namespace std;

int main()
{
    char name;
    int password;

    cout << "Enter the name: "; cin >> name;
    cout << " Enter your password: "; cin >> password;
    if (name == 'GG') {
        if (password == 1346) {
            cout << "Login successful";
        }
        else {
            cout << "Incorrect PASSWORD, Try again.";
        }
    }
    else {
        cout << " Incorrect Login Details, Try again.";
    }
}

Enter the name: GG
Enter your password: 1346
Login successful