如何抓住从一些数字些？ [英] How to grab some digits from a number?

问题描述

让我们说我们有以下一些。

Let us say we have the following number.

数= 2001000200030

Number = 2001000200030

我怎么能抢到第一位，并将其存储到一个变量？然后
 抓住下一个四位数字，并将其存储到另一个变量？
那么接下来的四个数字...

How can I grab the first digit and store it to a variable? Then grab the next four digits and store them to another variable? Then the next four digits ...

所以输出应该是这样的。

So the output should be like this.

第一= 2;

firstfour = 0010

firstfour = 0010

secondfour = 0020

secondfour = 0020

thirdfour = 0030

thirdfour = 0030

感谢你和我AP preciate你的时间。

Thank you and I appreciate your time.

推荐答案

为什么要使用字符串时，你可以处理数字的坚持？您可以通过使用10次幂取模和除法的数字拆分。

Why use strings when you can stick with processing numbers? You can split by digits using modulo and division in powers of 10.

#include <stdio.h>

int main(void) {
    long long number = 2001000200030LL;

    /* Find power of 10 for top digit */
    long long currentDigit = 1LL;
    while((currentDigit * 10LL) < number) currentDigit *= 10LL;

    printf("First digit = %lld\n", number / currentDigit);
    number %= currentDigit;

    /* Read off groups of four digits */
    while(currentDigit >= 10000LL)
    {
        long long nextFour;
        currentDigit /= 10000LL;
        nextFour = number / currentDigit;
        number %= currentDigit;
        printf("Next four = %04lld\n", nextFour);
    }

    /* Output any remaining digits not covered by a group of four */
    if (currentDigit > 1LL)
    {
        printf("Remaining digits = ");
        for(currentDigit /= 10LL; currentDigit > 1LL; currentDigit /= 10LL)
        {
            printf("%lld", (number / currentDigit) % 10LL);
        }
        printf("%lld\n", number % 10LL);
    }

    return 0;
}

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