标签：style blog color io 文件 ar div log
1：编写一个程序，确定分别由signed ,unsigned 限定的char short long int的取值范围。采用打印标准头文件中的相应值以及直接计算两种方式实现。
头文件的实现方式：
#include <stdio.h>
#include <limits.h>
/*determin range of int types*/
int main(){
/*signed*/
printf("signed char min = %d\n",SCHAR_MIN);
printf("signed char max = %d\n",SCHAR_MAX);
printf("signed short min = %d\n",SHRT_MIN);
printf("signed short max = %d\n",SHRT_MAX);
printf("signed int min = %d\n",INT_MIN);
printf("signed int max = %d\n",INT_MAX);
printf("signed long min = %ld\n",LONG_MIN);
printf("signed long max = %ld\n",LONG_MAX);
/*unsigned*/
printf("signed char max=%u\n",UCHAR_MAX);
printf("signed short max = %u\n",USHRT_MAX);
printf("signed int max = %u\n",UINT_MAX);
printf("signed long max = %lu\n",ULONG_MAX);
getchar();
return 0;
}
直接计算：
#include <stdio.h> /* ~0 取反 全部变成1 (unsigned char)~0 变成无符号的 (unsigned char)~0>>1 右移一位清除符号位 (char)(unsigned char)~0>>1 转化为char类型 */ int main(){ /*singed*/ printf("min of singed char = %d\n",-(char)((unsigned char)~0>>1)); printf("max of singed char = %d\n",(char)((unsigned char)~0>>1)); printf("min of singed short = %d\n",-(short)((unsigned short)~0>>1)); printf("max of singed short = %d\n",(short)((unsigned short)~0>>1)); printf("min of singed int = %ld\n",-(int)((int long)~0>>1)); printf("max of singed int = %ld\n",(int)((int long)~0>>1)); printf("min of singed long = %ld\n",-(long)((unsigned long)~0>>1)); printf("max of singed long = %ld\n",(long)((unsigned long)~0>>1)); /*unsigned*/ printf("max of singed char = %u\n",(unsigned char)~0); printf("max of singed char = %u\n",(unsigned short)~0); printf("max of singed char = %u\n",(unsigned int)~0); printf("max of singed char = %lu\n",(unsigned long)~0); getchar(); return 0 ; }
标签：style blog color io 文件 ar div log
原文地址：http://www.cnblogs.com/luochuanghero/p/3894165.html
