/*

* =========================================================

* Filename: range.c

* Description: How to write C code to print range of basic data types like

* int, char, short int, unsigned int, unsigned char etc?

* It may be assumed that signed numbers are stored in 2′s complement form.

* hint: 得到正确的二进制形式

*

* =========================================================

*/

#include <stdio.h>

#include <assert.h>

#define ElemType int

int main(){

ElemType start = 1;

ElemType from , to;

ElemType bits = sizeof(start) * 8;

if((start - 2) > 0){// 无符号数

from = 0;

to = (start << (bits - 1)) + ((start << (bits - 1)) - 1);

printf("this type is from %u to %u\n",from ,to);

}

else{//signed type

from = -(start << (bits - 1));

to = (start << (bits - 1)) - 1;

printf("this type is from %d to %d\n",from ,to);

}

return 0;

}