C++ -如何找到整数的长度

#include <iostream>
#include <string>

int getIntegerLength(int number) {
    if (number == 0) return 1; // 特殊情况处理
    return std::to_string(std::abs(number)).length();
}

int main() {
    int number = -12345;
    std::cout << "The length of the integer is: " << getIntegerLength(number) << std::endl;
    return 0;
}

#include <iostream>
#include <cmath>

int getIntegerLength(int number) {
    if (number == 0) return 1; // 特殊情况处理
    number = std::abs(number);
    int length = 0;
    while (number > 0) {
        number /= 10;
        length++;
    }
    return length;
}

int main() {
    int number = -12345;
    std::cout << "The length of the integer is: " << getIntegerLength(number) << std::endl;
    return 0;
}

#include <iostream>
#include <cmath>

int getIntegerLength(int number) {
    if (number == 0) return 1; // 特殊情况处理
    return std::floor(std::log10(std::abs(number))) + 1;
}

int main() {
    int number = -12345;
    std::cout << "The length of the integer is: " << getIntegerLength(number) << std::endl;
    return 0;
}