CPP If Else statement is a conditional statement, which can be used in various forms to check a condition or multiple conditions and to perform the specified action or actions, if the particular condition is true. These are:
- if :
If statement is used to perform an action if a single condition is true.
Syntax:
if (condition)
{
Execute this code if condition is true; else nothing to be executed;
}
- ..else:
If else statement is used to perform an action if a single condition is true and to perform another action if that condition is false.
Syntax:
if (condition)
{
Execute this code if condition is true;
}
else
{
Execute this code if condition is false;
}
- ..else if….else:
If elseif else statement is used to perform different actions for different conditions.
Syntax:
if (condition)
{
Execute this code if this condition is true;
}
else if (condition)
{
Execute this code if this condition is true;
}
else
{
Execute this code if all the conditions are false;
}
Example 1: Example of if statement
#include <iostream> using namespace std; int main() { int age; cout << "Enter your age: "; cin >> age; if (age < 18) cout << "You are not eligible to vote!"; return 0; } |
Output
Enter your age: 17 You are not eligible to vote! |
Example 2: Example of if..else statement
#include <iostream> using namespace std; int main() { int age; cout << "Enter your age: "; cin >> age; if (age < 18) cout << "You are not eligible to vote!"; else cout << "You are eligible to vote!"; return 0; } |
Output
You are eligible to vote! |
Example 3: Example of if..else if..else statement
#include <iostream> using namespace std; int main() { int age; cout << "Enter your age: "; cin >> age; if (age < 18) cout << "You are not eligible to vote!"; else if (age = 18) cout << "Welcome new voter!"; else cout << "You are eligible to vote!"; return 0; } |
Output
Welcome new voter! |