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C语言各数据类型所占字节大小

infgrad 2022-01-05 阅读 139
各类型变量占内存大小
C语言32位机64位机
char1字节1字节
short int2字节2字节
int4字节4字节
long int4字节4字节
long long int8字节8字节
float4字节4字节
double8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)


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:

 

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