# D Programming - Relational Operators

The following table shows all the relational operators supported by D language. Assume variable A holds 10 and variable B holds 20, then −

Operator Description Example
== Checks if the values of two operands are equal or not, if yes then condition becomes true. (A == B) is not true.
!= Checks if the values of two operands are equal or not, if values are not equal then condition becomes true. (A != B) is true.
> Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true. (A > B) is not true.
< Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true. (A < B) is true.
>= Checks if the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true. (A >= B) is not true.
<= Checks if the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true. (A <= B) is true.

## Example

Try the following example to understand all the relational operators available in D programming language −

```import std.stdio;

int main(string[] args) {
int a = 21;
int b = 10;
int c ;

if( a == b ) {
writefln("Line 1 - a is equal to b\n" );
} else {
writefln("Line 1 - a is not equal to b\n" );
}

if ( a < b ) {
writefln("Line 2 - a is less than b\n" );
} else {
writefln("Line 2 - a is not less than b\n" );
}

if ( a > b ) {
writefln("Line 3 - a is greater than b\n" );
} else {
writefln("Line 3 - a is not greater than b\n" );
}

/* Lets change value of a and b */
a = 5;
b = 20;

if ( a <= b ) {
writefln("Line 4 - a is either less than or equal to b\n" );
}
if ( b >= a ) {
writefln("Line 5 - b is either greater than or equal to b\n" );
}
return 0;
}
```

When you compile and execute the above program it produces the following result −

```Line 1 - a is not equal to b

Line 2 - a is not less than b

Line 3 - a is greater than b

Line 4 - a is either less than or equal to b

Line 5 - b is either greater than or equal to b
```
d_programming_operators.htm