🔒 Locked

Stupid C/C++ errors - valid syntax, incorrect effect

Started by intransigent-seal May 10, 2003 at 10:36 PM 5 replies 750+ views

Original Post

102

May 10, 2003 at 10:36 PM

What stupid bugs have you had in your programs that were caused by C or C++ letting you write code that does nothing at all, or something completely stupid? I'll start:

  
// the cliche

if (foo = bar)
  qux();
// should be ==, not =


// the not-quite-so-cliche sibling

foo == bar;
// should be =, not ==, this code is valid syntax, but does nothing


while (foo);
{
  bar();
  qux();
}
// there shouldn't be a semi-colon after the condition of the while loop

// This just executes bar() and qux() once, whatever foo is

[edit: formatting] JohnB [edited by - JohnBSmall on May 10, 2003 11:39:40 PM]

Xtremehobo

263

Xtremehobo

May 10, 2003 at 10:39 PM

  
if (foo==bar) {
qux();
..rest of program
//sometimes I forget to close off an if statement with the }

-----
I 4M T3H SIGN4TUR3 FR0M H311x0res!

Tron3k

197

Tron3k

May 10, 2003 at 11:22 PM

I usually put in this:

if (foo == bar) {
}

and then add the code in the middle.

987th Yak

May 10, 2003 at 11:41 PM

  
switch(foo); //ARGGG!!!

{
    case thing:
       stuff();
       break;

    case thing2:
       stuff2();
       break;
}

I hates it when I do that.....

It''s way harder than you''d think to pick a something good for these....

Dredge-Master

Aug 16, 2003 at 5:26 AM

Ansi C and Borland syntax

(only found out recently with gdarena)

if(dw.buttons&JOY_BUTTON1 && dw.buttons&JOY_BUTTON2)

works fine

under msvc6 (haven''t changed any project settings, so for all I know the default may NOT be ansi C)
if(dw.buttons&JOY_BUTTON1 && dw.buttons&JOY_BUTTON2)

fails
have to use
if(dw.buttons&JOY_BUTTON1 && (dw.buttons&JOY_BUTTON2))

as the order of opps doesn''t follow ansi C.

But hey, I guess it makes it easier to read

bastardos

Aug 16, 2003 at 5:35 AM

Okay, compiler-bashing it is.

void Function (char * something)
{
//blah blah
*pointer++ = something [index];
//blah blah
}

Used to work fine, ''til I switched to Dev-C++ (MingW).

void Function (char * something)
{
char * somethingelse = something;
//blah blah
*pointer++ = somethingelse [index];
//blah blah
}

Worked again.

-bas

FAQ Master

Aug 16, 2003 at 5:37 AM

OMFG!!!!11 NECRO!!!!!1

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.