Relational Operators

Relational Operators 

Often it is required to compare the relationship between operands and bring out a decision and program accordingly. These comparisons can be done with the help of operators known as “relational operators”. An expression containing relational operator is known as “relational expression”.

Operator	Meaning	Operator	Meaning
<	is less than	>=	is greater than or equal to
<=	is less than or equal to	==	is equal to
>	is greater than	!=	is not equal to

A simple relational expression contains only one relational operator and takes the following form.

exp1    relational-operator     exp2

Where exp1 and exp2 are expressions, which may be simple constants, variables or combination of them.

Relation Expression returns non-zero value if the condition is TRUE otherwise returns zero when the condition is false.

6.7<=10           TRUE
7.5<-10           FALSE

-42>=0                        FALSE

10<9+4            TRUE
a+b==c+d        TRUE only if sum of a & b and sum of c & d are equal otherwise FALSE.

Relational expressions are used in decision making statements of C language such as if, while and for statements to decide the course of action of a running program.