C 语言实例 – 八进制与二进制相互转换

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

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