cif-statementvariablesdeclareansi-c

Declare variable in if statement (ANSI C)

Is there any way to declare variable in if statement (using ANSI C only) ?

Example:

if(int variable = some_function())
{
    return 1;
}
Solution

  • No, you cannot do that.

    What you can do is create a compound statement (anonymous or hanging block) just for the if

        {
        int variable;
        variable = some_function();
        if (variable) return 1;
    }
    /* variable is out of scope here */

    Note that for this simple case you can call the function as the condition of the if (no need for an extra variable)

    if (some_function()) return 1;