C语言编程练习之二进制与八进制相互转换

爱被打了一巴掌 2023-07-14 08:04 14阅读 0赞

**二进制转换为八进制：**  
思路：先将二进制转换为十进制（详细参考我的这篇博客 [二、十进制相互转换][Link 1]），然后将十进制转换为八进制（这个我们很熟悉）。  
**具体代码如下：**

#include <stdio.h>
    #include <math.h>
    int main()
    { 
        long long x;
        printf("输入一个二进制数: \n");
        scanf("%lld", &x);
        printf("二进制数 %lld 转换为八进制为 %d", x, convert(x));
        return 0;
    } 
    int convert(long long x)
    { 
        int octalNumber = 0, decimalNumber = 0, i = 0;
        while(x != 0)
        { 
            decimalNumber += (x%10) * pow(2,i);
            ++i;
            x/=10;
        }
        i = 1;
        while (decimalNumber != 0)
        { 
            octalNumber += (decimalNumber % 8) * i;
            decimalNumber /= 8;
            i *= 10;
        }
        return octalNumber;
    }

结果如下：![在这里插入图片描述][20200313192625879.png]  
**八进制转换为二进制：**  
思路：八进制先转换为十进制再转换为二进制。  
**具体代码：**

#include <stdio.h>
    #include <math.h>
    long long convert(int x);
    int main()
    { 
        int x;
        printf("输入一个八进制数: ");
        scanf("%d", &x);
        printf("八进制数 %d 转二进制为 %lld", x, convert(x));
        return 0;
    } 
    long long convert(int x)
    { 
        int decimalNumber = 0, i = 0;
        long long binaryNumber = 0;
        while(x != 0)
        { 
            decimalNumber += (x%10) * pow(8,i);
            ++i;
            x/=10;
        }
        i = 1;
        while (decimalNumber != 0)
        { 
            binaryNumber += (decimalNumber % 2) * i;
            decimalNumber /= 2;
            i *= 10;
        }
        return binaryNumber;
    }

**结果如下：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1JESkU1NjUyMw_size_16_color_FFFFFF_t_70]

[Link 1]: https://blog.csdn.net/RDJE56523/article/details/104840962
[20200313192625879.png]: /images/20230529/4e1624ec31cb4a33a979add9b7717ea9.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1JESkU1NjUyMw_size_16_color_FFFFFF_t_70]: /images/20230529/b6bbe8db68364d45881c99939c444630.png