If statement in C++

If block contains the condition, if condition is true, then the statement will execute and if the condition is not true then the statement will not execute.

Syntax :

if(boolean_expression){
//statements will execute if the boolean expression is true
}               

Block Diagram :

Example:

#include<iostream>
using namespace std; 
int main () {
   // local variable declaration:
   int a = 10; 
   // check the boolean condition
   if( a < 20 ) {
      // if condition is true then print the following
      cout << "a is less than 20" << endl;
   }
   cout << "value of a is : " << a << endl; 
   return 0;
}                   
                

a is less than 20
value of a is : 10

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