An if statement can be followed by an optional else statement, which executes when the boolean expression is false.Syntax:
// statement(s) will execute if the boolean expression is true
// statement(s) will execute if the boolean expression is false
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;
// if condition is false then print the following
cout << "a is not less than 20;" << endl;
cout << "value of a is : " << a << endl;
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