c语言中输出各种数据类型的长度

 

c语言中输出各种数据类型的长度:

[root@PC1 test]# ls
test.c
[root@PC1 test]# cat test.c          ## 测试程序
#include <stdio.h>
int main(void)
{
        printf("size of char: %u\n", (unsigned)sizeof(char));
        printf("size of signed char: %u\n", (unsigned)sizeof(signed char));
        printf("size of unsigned char: %u\n", (unsigned)sizeof(unsigned char));
        puts("-----------------------------------------------------------");
        printf("size of signed int: %u\n", (unsigned)sizeof(signed int));
        printf("size of unsigned int: %u\n", (unsigned)sizeof(unsigned int));
        puts("-----------------------------------------------------------");
        printf("size of float: %u\n", (unsigned)sizeof(float));
        printf("size of double: %u\n", (unsigned)sizeof(double));
        printf("size of long double: %u\n", (unsigned)sizeof(long double));
        return 0;
}
[root@PC1 test]# gcc test.c -o kkk      ## 编译
[root@PC1 test]# ls
kkk  test.c
[root@PC1 test]# ./kkk                  ## 测试
size of char: 1
size of signed char: 1
size of unsigned char: 1
-----------------------------------------------------------
size of signed int: 4
size of unsigned int: 4
-----------------------------------------------------------
size of float: 4
size of double: 8
size of long double: 16

 

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