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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