if is a keyword to allow conditional program flow:


if ( /* condition */ )

{

  //Do this when condition is true

}

Optionally, an if statement can be followed by an else statement:


if ( /* condition */ )

{

  //Do this when condition is true

  

}

else

{

  //Do this when condition is false

}

Example


#include <iostream>

 

//Draw a random number

const int x = std::rand();

 

if (x % 2 == 0)

{

  std::cout << " The value of " << x << " is even." << std::endl;

}

else

{

  std::cout << " The value of " << x << " is odd." << std::endl;

}

Yoda condition (from The Dodgy Coder

When the constant value (for example '6') is put first, so one can be sure that an unintentional assignment (for example 'if (6 = value)') is detected by the compiler.


int main()

{

  const int value = 1 + (std::rand() % 6);

  if (6 == value) //A Yoda condition

  {

    //Do something

  } 

}

Go back to Richel Bilderbeek's C++ page.

Go back to Richel Bilderbeek's homepage.

(C++) if

Example

Yoda condition (from The Dodgy Coder