【C语言】计算整型和无符号整型的取值范围

#include<stdio.h>
int main()
{
         int a=0,b=1;
         while (a<b)
          {
             a++;
             b++;
          }
        printf("%d\n",a);
        printf("%d\n",b);
}

#include<stdio.h>
int main()
{
         unsigned a=0,b=1;
         while (a<b)
          {
             a++;
             b++;
          }
        printf("%u\n",a);
        printf("%u\n",b);
}