Trying to figure out how to get my calculator to "Quit" on command given

[MeTh0Dz|Reb0rn]

The break is there for completeness I would assume.

[Xav]

Does it matter, though?

[MeTh0Dz|Reb0rn]

In the context of running the code, no, but some people just like to have everything 'exact'.

[Xav]

Like when I make all my XHTML 100% valid. I see.

[Aereshaa]

It could also help if the implicit call to _exit(0) fails. It never does, though.
Also, there are if_integer and str2int functions in standard C, let alone C++.
It's called strtol. To get an int x from stdin:

char * str = malloc(200);
str = fgets(str,200,stdin);
char * s2;
int x = strtol(s,NULL,10);
free(s);

[Hawk1]

this is all good stuff to know, thanks for the new knowledge so far guys, i appreciate it.