C語言數據類型大小sizeof %zd

## 類型大小sizeof

sizeof是C語言的內置運算符，已字節為單位給出指定類型的大小。C99和C11提供%zd轉換說明匹配sizeof的返回類型（即，size_t類型）。一些不支持C99和C11的編譯器可用%u和%lu代替%zd。

 

代碼示例
#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;
}

運行結果如下：
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.