C语言十进制与八进制的相互转换

#include <stdio.h>
int conversion(int decimalNumber);
int main()
{
    int number;
    printf("请输入一个十进制数：\n");
    scanf("%d",&number);
    printf("十进制数%d转八进制数为%d",number,conversion(number));
    return 0;
}
int conversion(int decimalNumber)
{
    int octalNumber = 0,i=1;
    while(decimalNumber != 0)
    {
        octalNumber += (decimalNumber % 8)*i;
        decimalNumber /= 8;
        i *= 10;
    }
    return octalNumber;
}

十进制数12转换八进制数为14

#include <stdio.h>
#include <math.h>
int conversion (long long octalNumber);
int main()
{
    long long octalNumber;
    printf("请输入一个八进制数：\n");
    scanf("%lld",&octalNumber);
    printf("八进制数%lld转换十进制数为%d",octalNumber,conversion(octalNumber));
    return 0;
}
int conversion (long long octalNumber)
{
    int decimalNumber = 0,i = 0,n;
    while(octalNumber != 0)
    {
        n = octalNumber % 10;
        octalNumber /= 10;
        decimalNumber += n*pow(8,i);
        ++i;
    }
    return decimalNumber;
}

八进制数14转换十进制数为12