Discussion :: C Preprocessor - Yes / No Questions (Q.No.7)
| Tim said: (Dec 7, 2010) | |
| Your answer depends on the CONTENTS of the header file. For example, a header file that is EMPTY can be included as many times as you like! | |
| Chetana said: (Mar 18, 2011) | |
| Dont you think your explaination & Answer are differ. Please reply. | |
| Pruthvi said: (Sep 17, 2011) | |
| Can any one tel me what will b the error if we include an header file twice. ? as the linker will link to any of the headerfiles function then how the error comes. ? | |
| Saravanan A said: (Dec 1, 2011) | |
| Yes its very much dependent on the content. If only extern function declarations and extern variable declarations are there it will not be a issue. Only if some types are defined like structure - redefinition error will come. Or if a variable if defined which is a rare case though. | |
| Onkar said: (Jan 25, 2012) | |
| I didn't get it please explain it again in simple words. | |
| George said: (Jan 8, 2013) | |
| It depends in the header file. If there are inclusion guards, then it should be OK. Eg: #ifndef __STDIO_H__ #define __STDIO_H__ <contents> #endif Once the header is a called a second time, #ifndef __STDIO_H__ will evaluate to FALSE. |
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| Gurunath said: (Dec 18, 2014) | |
| We don't understand clearly. | |
| Vjay said: (Jun 11, 2017) | |
| #define calc(a,b) (a*b)/(a-b) main() { Int a=20,b=10; Printf("%d", calc(a+4,b-2)); } What will be the answer? Please tell me. |
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