If Else Statement in C++

IF

The if statement evaluates the test expression inside the parenthesis ().

• If the test expression is evaluated to true, statements inside the body of if are executed.

• If the test expression is evaluated to false, statements inside the body of if are not executed.

Syntax:

if(condition){    
//code to be executed   
}

Example:

#include <stdio.h>
int main() {
    int number;

    printf("Enter an integer: ");
    scanf("%d", &number);

    // true if number is less than 0if (number < 0) {
        printf("You entered %d.\n", number);
    }

    printf("The if statement is easy.");

    return 0;
}

Output:

Enter an integer: -2
You entered -2.
The if statement is easy.

IF ELSE

If the test expression is evaluated to true,

• statements inside the body of if are executed.

• statements inside the body of else are skipped from execution.

If the test expression is evaluated to false,

• statements inside the body of else are executed

• statements inside the body of if are skipped from execution.

Syntax:

if(condition){    
//code if condition is true   
}else{    
//code if condition is false   
} 

Example:

// Check whether an integer is odd or even
#include <stdio.h>
int main() {
    int number;
    printf("Enter an integer: ");
    scanf("%d", &number);

    // True if the remainder is 0if  (number%2 == 0) {
        printf("%d is an even integer.",number);
    }
    else {
        printf("%d is an odd integer.",number);
    }

    return 0;
}

Output:

Enter an integer: 7
7 is an odd integer.