Check the bits in linux

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于 2013-08-29 10:09:21 发布

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分类专栏： c program

本文链接：https://blog.youkuaiyun.com/ziliangxiao/article/details/10487281

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 #include <stdio.h>
 #include <bits/wordsize.h>
 
 
 int main() {
    #if __WORDSIZE==32 
     printf("The system is 32 bits\n");
   #endif
    #if __WORDSIZE==64
     printf("The system is 64 bits\n");
 #endif
     return 0;
 }

#include <stdio.h>
 
 
 int main() {
    #ifdef  __x86_64__ 
     printf("The system is 64 bits\n");
   #endif
    #ifdef __i386__ 
     printf("The system is 32 bits\n");
 #endif
     return 0;
 }

__x86_64__ and __i386___ is defined by the compiler.