C语言查看各种数据类型的size

C语言查看各种数据类型的sizeintptr_t 定义在/usr/include/stdint.h，#if __WORDSIZE == 64# ifndef __intptr_t_defined
typedef long int intptr_t;
# define __intptr_t_defined
# endif
typedef unsigned long int uintptr_t;
#else
# ifndef __intptr_t_defined
typedef int intptr_t;
# define __intptr_t_defined
# endif
typedef unsigned int uintptr_t;
#endif #include <stdio.h>#include <stdint.h>int main（void）
{
int *ptr;
printf（"sizeof int is %d ",sizeof（int））;
printf（"sizeof char is %d ",sizeof（char））;
printf（"sizeof short is %d ",sizeof（short））;
printf（"sizeof long is %d ",sizeof（long））;
printf（"sizeof float is %d ",sizeof（float））;
printf（"sizeof double is %d ",sizeof（double））;
printf（"sizeof pointer is %d ",sizeof（ptr））;
printf（"sizeof unsiged int is %d ",sizeof（unsigned int））;
//store pointers in integer type,use size_t,INT_PTR,intptr_t;
printf（"sizeof size_t is %d ",sizeof（size_t））;
//intptr_t defines in stdint.h
printf（"sizeof intptr_t is %d ",sizeof（intptr_t））;
//INT_PTR only exist in windows
//printf（"sizeof INT_PTR is %d ",sizeof（INT_PTR））;

}查看各种数据类型的MAX 和MIN 值#include <stdio.h>#include <limits.h>
#include <float.h>
int main（）
{
printf（"The value of INT_MAX is %i ", INT_MAX）;
printf（"The value of INT_MIN is %i ", INT_MIN）;
printf（"An int takes %d bytes ", sizeof（int））;printf（"The value of FLT_MAX is %f ", FLT_MAX）;
printf（"The value of FLT_MIN is %.50f ", FLT_MIN）;
printf（"A float takes %d bytes ", sizeof（float））;printf（"The value of CHAR_MAX is %d ", CHAR_MAX）;
printf（"The value of CHAR_MIN is %d ", CHAR_MIN）;
printf（"A CHAR takes %d bytes ", sizeof（char））;printf（"The value of DBL_MAX is %f ", DBL_MAX）;
printf（"The value of DBL_MIN is %.50f ", DBL_MIN）;
printf（"A double takes %d bytes ", sizeof（double））;printf（"The value of SHRT_MAX is %d ", SHRT_MAX）;
printf（"The value of SHRT_MIN is %d ", SHRT_MIN）;
printf（"A short takes %d bytes ", sizeof（short））;printf（"The value of LONG_MAX is %Ld ", LONG_MAX）;
printf（"The value of LONG_MIN is %Ld ", LONG_MIN）;
printf（"A long takes %d bytes ", sizeof（long））;
return 0;
}在stdint.h 里面定义了很多int*_t 和uint*_t 类型。#include <apue.h>#include <stdint.h>
#include <limits.h>int main（int argc, char *argv[]）
{
printf（"CHAR_BIT is %d ",CHAR_BIT）;
printf（"sizeof（char） is %d ",sizeof（char））;
printf（"sizeof（short） is %d ",sizeof（short））;
printf（"sizeof（int） is %d ",sizeof（int））;
printf（"sizeof（long） is %d ",sizeof（long））;
printf（"sizeof（long long） is %d ",sizeof（long long））;

printf（"sizeof（int8_t） is %d ",sizeof（int8_t））;
printf（"sizeof（int16_t） is %d ",sizeof（int16_t））;
printf（"sizeof（int32_t） is %d ",sizeof（int32_t））;
printf（"sizeof（int64_t） is %d ",sizeof（int64_t））; printf（"sizeof（uint8_t） is %d ",sizeof（uint8_t））;
printf（"sizeof（uint16_t） is %d ",sizeof（uint16_t））;
printf（"sizeof（uint32_t） is %d ",sizeof（uint32_t））;
printf（"sizeof（uint64_t） is %d ",sizeof（uint64_t））;

char a,b;
printf（"sizeof（a+b） is %d ",sizeof（a+b））;
}本文永久更新链接地址：http://www.linuxidc.com/Linux/2015-12/126197.htm