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05-08-2008, 06:54 AM
| #1 |
| Registered User Join Date: May 2008
Posts: 2
|  Little question about postfix and prefix Code: { int myInt;
myInt = 5;
printf( "myInt++ ---> %d\n\n++myInt ---> %d", myInt++, ++myInt);
}
"myInt++ ---> 5 ++myInt ---> 7" but it actually gave: "myInt++ ---> 6 ++myInt ---> 7" with a warning: operation on 'myInt' may be undefined. Can some one help me out? I'm so confused by the result and the warning message. |
| firebird is offline |  |
|
05-08-2008, 07:00 AM
| #2 |
| C++ Witch  Join Date: Oct 2003 Location: Singapore
Posts: 10,356
| Read this C FAQ on expressions.
__________________ C + C++ Compiler: MinGW port of GCC Build + Version Control System: SCons + Bazaar Look up a C/C++ Reference and learn How To Ask Questions The Smart Way |
| laserlight is online now | |
|
05-08-2008, 07:21 AM
| #3 |
| and the hat of sweating Join Date: Aug 2007 Location: Toronto, ON
Posts: 3,120
| Changing a variable more than once in a single statement is undefined. |
| cpjust is offline | |
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05-08-2008, 07:27 AM
| #4 |
| Registered User Join Date: May 2008
Posts: 2
| Thank you guys very much. |
| firebird is offline | |
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| Tags |
| postfix, prefix, printf |
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