如何从在C号提取数字？从最显著位开始时？ [英] How to extract digits from a number in C? Begining from the most significant digit?

问题描述

从数量从C中的至少显著开始四处位数为pretty容易：

Getting digits from a number beginning from the least significant in C is pretty easy:

#include <stdio.h>

int main()
{
    int num = 1024;

    while(num != 0)
    {
        int digit = num % 10;
        num = num / 10;
        printf("%d\n", digit);
    }


    return 0;
}

但是如何提取从第一个数字（在这里是1）开始的数字，该解决方案可以应用于任何数目的

But how to extract digits beginning from the first digit (here 1), that the solution could be applied to any number?

这将是微不足道的使用数组，但我不希望使用数组，我不希望使用逻辑运算符。

It would be trivial with arrays, but I don't want to use array, and I don't want to use logical operators.

推荐答案

假设一个32位有符号数为正，那么作为一个简单的例子：

Assuming a 32 bit signed number that is positive, then as a simple example:

#include <stdio.h>

int main()
{
int rmdr;
int dvsr;
int quot;
    scanf("%d", &rmdr);               // read in number
    dvsr = 1000000000;
    while(0 >= (quot = rmdr / dvsr)){ // skip leading zeroes
        rmdr %= dvsr;
        dvsr /= 10;
        if(dvsr == 1)
            break;
    }
    while(dvsr){                      // display number
        quot = rmdr / dvsr;
        printf("%1d", quot);
        rmdr %= dvsr;
        dvsr /= 10;
    }
    printf("\n");
    return(0);
}

或将小幅优化：

int main()
{
int rmdr;
int rm10;
int dvsr;
int quot;
    scanf("%d", &rmdr);               // read in number
    rm10 = rmdr/10;
    dvsr = 1;
    while(dvsr < rm10)                // skip to 1st digit
        dvsr *= 10;
    while(dvsr){                      // display number
        quot = rmdr / dvsr;
        printf("%1d", quot);
        rmdr %= dvsr;
        dvsr /= 10;
    }
    printf("\n");
    return(0);
}

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