各类型变量占内存大小

C语言	32位机	64位机
char	1字节	1字节
short int	2字节	2字节
int	4字节	4字节
long int	4字节	4字节
long long int	8字节	8字节
float	4字节	4字节
double	8字节	8字节
指针（ * ）	4字节	8字节

（以上基于dev32位以及64位测试）

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32位测试代码：

#include<stdio.h>
int main(){
	printf("32位:\n");
	printf("char  :%d\n",sizeof(char));	
	printf("char* :%d\n",sizeof(char *));
	printf("short :%d\n",sizeof(short));
	printf("short *:%d\n",sizeof(short *));
	printf("int :%d\n",sizeof(int));
	printf("int * :%d\n",sizeof(int *));
	printf("long int :%d\n",sizeof(long int));
	printf("long int * :%d\n",sizeof(long int *));
	printf("long long int :%d\n",sizeof(long long int));
	printf("long long int * :%d\n",sizeof(long long int *));
	printf("float :%d\n",sizeof(float));
	printf("float * :%d\n",sizeof(float *));
	printf("double :%d\n",sizeof(double));
	printf("double * :%d\n",sizeof(double *));
} 

运行结果：

 

---

64位测试代码：

#include<stdio.h>
int main(){
	printf("64位:\n");
	printf("char  :%d\n",sizeof(char));	
	printf("char* :%d\n",sizeof(char *));
	printf("short :%d\n",sizeof(short));
	printf("short *:%d\n",sizeof(short *));
	printf("int :%d\n",sizeof(int));
	printf("int * :%d\n",sizeof(int *));
	printf("long int :%d\n",sizeof(long int));
	printf("long int * :%d\n",sizeof(long int *));
	printf("long long int :%d\n",sizeof(long long int));
	printf("long long int * :%d\n",sizeof(long long int *));
	printf("float :%d\n",sizeof(float));
	printf("float * :%d\n",sizeof(float *));
	printf("double :%d\n",sizeof(double));
	printf("double * :%d\n",sizeof(double *));
} 

运行结果：