c - C 程序查找数据类型中位数的问题

Question

我的任务是编写代码来查找某种数据类型可以容纳的最大值。我通过左移使用滚动 1 测试来执行此操作。它对于 int、char、short int 和 long int 工作得很好，但是我无法让它对于 unsigned in 和 unsigned char 工作。代码运行，但是当它到达那个点时，它就会卡住并且不输出任何内容。我将在下面附上我的完整代码。我怎样才能让它发挥作用，我做错了什么。我确保使用 %u 而不是 %d，我不确定我还需要更改什么。谢谢!!

//
//  File name: ewh9320_proj2_data_types_rotate.c
//  Author: Ethan Hall
//  Created for RIT CMPR271 on 9/25/19
//  Purpose: To find the maximum value of bits used for each data type
//
#include <stdio.h>
#include <math.h>
int main(void)
{
    //int
    int overflow0, previous0;
    while(1)
    {
        previous0 = overflow0;
        overflow0 = 1 + (previous0<<1);
        if(previous0 > overflow0)
        {
            printf("int:\n");
            printf("The max value is %d\n\n", previous0);
            break;
        }
    }

    //char
    char overflow1, previous1;
    while(1)
    {
        previous1 = overflow1;
        overflow1 = 1 + (previous1<<1);
        if(previous1 > overflow1)
        {
            printf("char:\n");
            printf("The max value is %d\n\n", previous1);
            break;
        }
    }

    //short int
    short int overflow2, previous2;
    while(1)
    {
        previous2 = overflow2;
        overflow2 = 1 + (previous2<<1);
        if(previous2 > overflow2)
        {
            printf("short int:\n");
            printf("The max value is %d\n\n", previous2);
            break;
        }
    }

    //unsigned int
    unsigned int overflow3, previous3;
    while(1)
    {
        previous3 = overflow3;
        overflow3 = 1 + (previous3<<1);
        if(previous3 > overflow3)
        {
            printf("unsigned int:\n");
            printf("The max value is %u\n\n", previous3);
            break;
        }
    }

    //unsigned char
    unsigned char overflow4, previous4;
    while(1)
    {
        previous4 = overflow4;
        overflow4 = 1 + (previous4<<1);
        if(previous4 > overflow4)
        {
            printf("unsigned char:\n");
            printf("The max value is %d\n\n", previous4);
            break;
        }
    }

    //long int
    long int overflow5, previous5;
    while(1)
    {
        previous5 = overflow5;
        overflow5 = 1 + (previous5<<1);
        if(previous5 > overflow5)
        {
            printf("long int:\n");
            printf("The max value is %ld\n\n", previous5);
            break;
        }
    }

}

第二个程序不会运行超过 int64_t:

int main(void)
{
    //int8_t
    int8_t overflow0, previous0;
    while(1)
    {
        previous0 = overflow0;
        overflow0 = 1 + (previous0<<1);
        if(previous0 > overflow0)
        {
            printf("int8_t:\n");
            printf("The max value is %d\n\n", previous0);
            break;
        }
    }

    //uint8_t
    uint8_t overflow1, previous1;
    while(1)
    {
        previous1 = overflow1;
        overflow1 = 1 + (previous1<<1);
        if(previous1 > overflow1)
        {
            printf("uint8_t:\n");
            printf("The max value is %u\n\n", previous1);
            break;
        }
    }

    //int16_t
    int16_t overflow2, previous2;
    while(1)
    {
        previous2 = overflow2;
        overflow2 = 1 + (previous2<<1);
        if(previous2 > overflow2)
        {
            printf("int16_t:\n");
            printf("The max value is %d\n\n", previous2);
            break;
        }
    }

    //uint16_t
    uint16_t overflow3, previous3;
    while(1)
    {
        previous3 = overflow3;
        overflow3 = 1 + (previous3<<1);
        if(previous3 > overflow3)
        {
            printf("uint16_t:\n");
            printf("The max value is %u\n\n", previous3);
            break;
        }
    }

    //int32_t
    int32_t overflow4, previous4;
    while(1)
    {
        previous4 = overflow4;
        overflow4 = 1 + (previous4<<1);
        if(previous4 > overflow4)
        {
            printf("int32_t:\n");
            printf("The max value is %d\n\n", previous4);
            break;
        }
    }


    //uint32_t
    uint32_t overflow5, previous5;
    while(1)
    {
        previous5 = overflow5;
        overflow5 = 1 + (previous5<<1);
        if(previous5 > overflow5)
        {
            printf("uint32_t:\n");
            printf("The max value is %u\n\n", previous5);
            break;
        }
    }

    //int64_t
    int64_t overflow6, previous6;
    while(1)
    {
        previous6 = overflow6;
        overflow6 = 1 + (previous6<<1);
        if(previous6 >= overflow6)
        {
            printf("int64_t:\n");
            printf("The max value is %lld\n\n", previous6);
            break;
        }
    }

    //uint64_t
    uint64_t overflow7, previous7;
    while(1)
    {
        previous7 = overflow7;
        overflow7 = 1 + (previous7<<1);
        if(previous7 > overflow7)
        {
            printf("uint64_t:\n");
            printf("The max value is %llu\n\n", previous7);
            break;
        }
    }

    //uintptr_t
    uintptr_t overflow8, previous8;
    while(1)
    {
        previous8 = overflow8;
        overflow8 = 1 + (previous8<<1);
        if(previous8 > overflow8)
        {
            printf("uintptr_t:\n");
            printf("The max value is %lu\n\n", previous8);
            break;
        }
    }

    //intmax_t
    intmax_t overflow9, previous9;
    while(1)
    {
        previous9 = overflow9;
        overflow9 = 1 + (previous9<<1);
        if(previous9 > overflow9)
        {
            printf("intmax_t:\n");
            printf("The max value is %ld\n\n", previous9);
            break;
        }
    }
}

Answer 1

我实际上发现通过在 if 语句中添加 >= 可以解决问题。谢谢!