C语言中查看类型的大小（占几个byte）

/*
sizeof是C语言的内置运算符，以字节为单位给出指定类型的大小。 C99和C11
提供%zd转换说明匹配sizeof的返回类型[2]。 一些不支持C99和C11的编译器可用%u
或%lu代替%zd 

*/

/* typesize.c -- 打印类型大小（单位是字节） */
#include <stdio.h>
int main(void)
{
/* C99为类型大小提供%zd转换说明 */
printf("Type int has a size of %zd bytes.
", sizeof(int));
printf("Type char has a size of %zd bytes.
", sizeof(char));
printf("Type long has a size of %zd bytes.
", sizeof(long));
printf("Type long long has a size of %zd bytes.
",
sizeof(long long));
printf("Type double has a size of %zd bytes.
",
sizeof(double));
printf("Type long double has a size of %zd bytes.
",
sizeof(long double));
return 0;
}