c++计数数字(非字符串)之间的空格

#include <iostream>
#include <string>

int countSpacesBetweenNumbers(const std::string& input) {
    int count = 0;
    bool isNumber = false;

    for (char c : input) {
        if (std::isdigit(c)) {
            if (!isNumber) {
                isNumber = true;
            }
        } else {
            if (isNumber) {
                count++;
                isNumber = false;
            }
        }
    }

    return count;
}

int main() {
    std::string input = "123 456 789";
    int spaces = countSpacesBetweenNumbers(input);
    std::cout << "Number of spaces between numbers: " << spaces << std::endl;

    return 0;
}