C语言数据类型大小sizeof %zd

## 类型大小sizeof

sizeof是C语言的内置运算符，已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（即，size_t类型）。一些不支持C99和C11的编译器可用%u和%lu代替%zd。

 

代码示例
#include<stdio.h>
int main()
{
    printf("Type int has a size of %zd bytes.\n",sizeof(int));
    printf("Type char has a size of %zd bytes.\n",sizeof(char));
    printf("Type long has a size of %zd bytes.\n",sizeof(long));
    printf("Type long long has a size of %zd bytes.\n",sizeof(long long));
    printf("Type double has a size of %zd bytes.\n",sizeof(double));
    printf("Type double has a size of %zd bytes.\n",sizeof(long double));
    return 0;
}

运行结果如下：
Type int has a size of 4 bytes.
Type char has a size of 1 bytes.
Type long has a size of 4 bytes.
Type long long has a size of 8 bytes.
Type double has a size of 8 bytes.
Type double has a size of 16 bytes.