unsigned int数据类型最大数

#include <stdio.h>

int main()
{
    unsigned int a = 1, b = 0;
    while (a>0)
    {
        a++;
    }
    
    printf("unsigned int数据类型最大数是：%u
", a-1 );

    unsigned int n = a - 1;
    do
    {
        n = n / 10;
        b++;
    } while (n > 0);
    printf("unsigned int数据类型最大数共有%d位。
", b);
    
    return 0;
}