How to count the number of digits in C language

In C language, the method of calculating the number of digits is to define the number of digits variable. Use a while loop to continuously divide by 10 and increment the number of bits variable. When the number divided by 10 becomes 0, the loop stops and the digits variable is returned.

How to calculate the number of digits in a number

In C language, you can use the following method to calculate the number of digits in a number :

Method:

1. Define a variable to store the number of digits.
2. Use a while loop to continuously divide by 10 and increment the number of bits variable in the loop.
3. When the number becomes 0 after dividing by 10, stop the loop and return the number of digits variable.

Code example:

#include <stdio.h>

int countDigits(int num) {
    int count = 0;
    while (num > 0) {
        count++;
        num /= 10;
    }
    return count;
}

int main() {
    int number;
    printf("请输入一个整数：");
    scanf("%d", &number);
    printf("该整数的位数为：%d\n", countDigits(number));
    return 0;
}

Explanation:

• countDigits() The function accepts an integer parameter and returns its number of digits.
• It uses a while loop to continuously divide by 10 and increment the count variable.
• When the number divided by 10 becomes 0, the loop stops and returns the count variable.
• main() The function gets an integer from the user and prints its digits.

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