c++ - How to declare a variable in the brackets of if statement? -

i want declare local variable in brackets of if statement. example.

if((char c = getc(stdin)) == 0x01)//this not ok g++. {     ungetc(c, stdin); }

what want is, see if character 1 want. commonly, want use variable(char c) both in line of if , body of if, not outside if.

but g++(gcc 4.8.1) says expected primary-expression before 'char'. wonder if there's way that, because don't want like

char c = getc(stdin); if(c == 0x01) {     bla... }

if it's namespace pollution worrying can define if statement within block:

{     char c = getc(stdin);     if(c == 0x01)     {         // ...     } }

so c last until end of block reached.

EXIT