C数据类型大小 [英] c data type size

问题描述

我怎么能知道所有数据类型的大小在我的电脑？

How i can know the size of all data type in my computer?

推荐答案

下面的程序应该做的伎俩为基本类型：

The following program should do the trick for the primitive types:

#include <stdio.h>
int main()
{
    printf("sizeof(char) = %d\n", sizeof(char));
    printf("sizeof(short) = %d\n", sizeof(short));
    printf("sizeof(int) = %d\n", sizeof(int));
    printf("sizeof(long) = %d\n", sizeof(long));
    printf("sizeof(long long) = %d\n", sizeof(long long));
    printf("sizeof(float) = %d\n", sizeof(float));
    printf("sizeof(double) = %d\n", sizeof(double));
    printf("sizeof(long double) = %d\n", sizeof(long double));
}

这定义打印的sizeof（char）的== 1 的类型使用的字节数与。正是1的装置（即这是多少比特）是实施方式特定的，并可能取决于底层硬件上。一些机器具有例如7位字节，有的有10或12位字节。

This prints the number of "bytes" the type uses, with sizeof(char) == 1 by definition. Just what 1 means (that is how many bits that is) is implementation specific and likely depend on the underlying hardware. Some machines have 7 bit bytes for instance, some have 10 or 12 bit bytes.

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