C 程序实现八进制数和十进制数互转

要理解此示例,您应该具备以下 C 语言编程主题的知识:

示例 1:将十进制转换为八进制的程序

#include <stdio.h>
#include <math.h>

int convertDecimalToOctal(int decimalNumber);
int main()
{
    int decimalNumber;

    printf("Enter a decimal number: ");
    scanf("%d", &decimalNumber);

    printf("%d in decimal = %d in octal", decimalNumber, convertDecimalToOctal(decimalNumber));

    return 0;
}

int convertDecimalToOctal(int decimalNumber)
{
    int octalNumber = 0, i = 1;

    while (decimalNumber != 0)
    {
        octalNumber += (decimalNumber % 8) * i;
        decimalNumber /= 8;
        i *= 10;
    }

    return octalNumber;
}

输出

Enter a decimal number: 78
78 in decimal = 116 in octal

示例 2:将八进制转换为十进制的程序

#include <stdio.h>
#include <math.h>

long long convertOctalToDecimal(int octalNumber);
int main()
{
    int octalNumber;

    printf("Enter an octal number: ");
    scanf("%d", &octalNumber);

    printf("%d in octal = %lld in decimal", octalNumber, convertOctalToDecimal(octalNumber));

    return 0;
}

long long convertOctalToDecimal(int octalNumber)
{
    int decimalNumber = 0, i = 0;

    while(octalNumber != 0)
    {
        decimalNumber += (octalNumber%10) * pow(8,i);
        ++i;
        octalNumber/=10;
    }

    i = 1;

    return decimalNumber;
}

输出

Enter an octal number: 116
116 in octal = 78 in decimal