sizeof直接常量时候c/c++解释不同-创新互联
见代码:
#include#includeint main(void){//直接常量时候c/c++解释不同
printf("%lu\n",sizeof 'a');//4(c) 1(c++)
//之后的c/c++解释相同
printf("%lu\n",sizeof "a");//2
char a = 'a';
const char *pa = "a";
printf("%lu\n",sizeof a);//1
printf("%lu\n",sizeof pa);//8
printf("%lu\n",sizeof 100);//4
printf("%lu\n",sizeof 100L);//8
return EXIT_SUCCESS;
}
编译环境:
root@DESKTOP-BE054DB:/mnt/i# gcc --version
gcc (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
Copyright © 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
root@DESKTOP-BE054DB:/mnt/i# g++ --version
g++ (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
Copyright © 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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