C++学习笔记：不用sizeof判断int类型占用几个字节

#include <stdio.h>

#include <string.h>

char *change(int val, int base, char *retbuf)

{

    static const char *str = "0123456789ABCDEF";

    char *p;

    char buf[15];
p = buf+14;

    *p = 0;
do { *--p = str[val % base]; } while( val /= base );

    strcpy(retbuf,p);

    return retbuf;

}
int main()

{
int i = 1;
char binbuf[32];

     printf("%s  %d\n", change(i, 2, binbuf), i);
int sum = 0;

     while(0 != i)

     {

          sum++;

          i = i<<1;

          printf("%s  %d\n", change(i, 2, binbuf), i);

     }
printf("sum = %d\n", sum);
}

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