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# Conditional Operators

From Appmethod Topics

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**Syntax**

logical-OR-expression ? expression : conditional-expression

**Remarks**

The conditional operator **?:** is a ternary operator.

In the expression `E1 ? E2 : E3`

, `E1`

evaluates first. If its value is **true**, then `E2`

evaluates and `E3`

is ignored. If `E1`

evaluates to **false**, then `E3`

evaluates and `E2`

is ignored.

The result of `E1 ? E2 : E3`

will be the value of either `E2`

or `E3`

depending upon which `E1`

evaluates.

`E1`

must be a scalar expression. `E2`

and `E3`

must obey one of the following rules:

- Both of arithmetic type.
`E2`

and`E3`

are subject to the usual arithmetic conversions, which determines the resulting type. - Both of compatible
**struct**or**union**types. The resulting type is the structure or union type of`E2`

and`E3`

. - Both of
**void**type. The resulting type is**void**. - Both of type pointer to qualified or unqualified versions of compatible types. The resulting type is a pointer to a type qualified with all the type qualifiers of the types pointed to by both operands.
- One operand is a pointer, and the other is a null pointer constant. The resulting type is a pointer to a type qualified with all the type qualifiers of the types pointed to by both operands.
- One operand is a pointer to an object or incomplete type, and the other is a pointer to a qualified or unqualified version of
**void**. The resulting type is that of the non-pointer-to-**void**operand.