sizeof 类型大小

最新推荐文章于 2024-08-05 02:00:04 发布

原创最新推荐文章于 2024-08-05 02:00:04 发布 · 256 阅读

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CC 4.0 BY-SA版权

本文介绍了在32位和64位系统下C语言内置类型的字节占用情况，并展示了复合类型如数组、指针及结构体的内存占用示例。

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内置类型：

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

return 0;

}

32位系统下，整形占4个字节。64位下，占8个。

结果：int :4
short :2
char :1
unsigned int :4
long :8
long long :8
float :4
double :8

long double :16

复合类型

#include<stdio.h>
struct test{
int a,b,c;
};
int main(){
int a[10];
int *i;
char *c;
double *d;
struct test var;
printf("a[10]: %d\n",sizeof(a));
printf("int *: %d\n",sizeof(i));
printf("char *: %d\n",sizeof(c));
printf("double *: %d\n",sizeof(d));
printf("struct: %d\n",sizeof(var));
return 0;
}