C++ LANGUAGE IF ELSE STATEMENT

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C++ LANGUAGE IF ELSE STATEMENT

if…else Statement 


An if statement can be followed by an optional else statement, 
which executes when the boolean expression is false. 
Syntax 
The syntax of an if...else statement in C++ is: 
if(boolean_expression) 
{ 
   // statement(s) will execute if the boolean expression is true 
} 
else 
{ 
  // statement(s) will execute if the boolean expression is false 
} 
If the boolean expression evaluates to true, then the if block of 
code will be executed, otherwise else block of code will be executed. 
Flow Diagram 
 
Example 
#include <iostream> 
using namespace std; 
  
int main () 
{ 
   // local variable declaration: 
   int a = 100; 
  
   // check the boolean condition 
   if( a < 20 ) 
   { 
       // if condition is true then print the following 
       cout << "a is less than 20;" << endl; 
   } 
   else 
   { 
       // if condition is false then print the following 
       cout << "a is not less than 20;" << endl; 
   } 
   cout << "value of a is : " << a << endl; 
  
   return 0; 
} 
When the above code is compiled and executed, it produces the following result: 
a is not less than 20; 
value of a is : 100