if statement in c++

  • If the conditional expression is true, the target of the if will be executed; otherwise, the target of the else, if it exists, will be executed. At no time will both be executed.
  • The conditional expression controlling the if may be any type of valid C++ expression that produces a true or false result.
  • The if statement allows you to put some decision making into your programs.

Syntax 

    if (condition)
 statement;
  • If the expression is true (nonzero) the statement will be executed.
  • If the expression is zero, the statement will not be executed.

Flow Diagram

    if-statement in c++ language

Example 

    // ifdemo.cpp
// demonstrates IF statement
#include using namespace std;

int main()
  {
    int x;

    cout > x;
    if( x > 100 )
    cout << “That number is greater than 100 ”; return 0;
  }

Output 

    Enter a number: 2000
That number is greater than 100