分解质因子c++代码

以下是一个用C++编写的分解质因数的代码示例：

#include <iostream>
#include <vector>

using namespace std;

vector<int> primeFactors(int n) {
    vector<int> factors;
    
    while (n % 2 == 0) {
        factors.push_back(2);
        n = n / 2;
    }
    
    for (int i = 3; i <= sqrt(n); i = i + 2) {
        while (n % i == 0) {
            factors.push_back(i);
            n = n / i;
        }
    }
    
    if (n > 2) {
        factors.push_back(n);
    }
    
    return factors;
}

int main() {
    int num;
    cout << "请输入一个正整数：";
    cin >> num;
    
    vector<int> factors = primeFactors(num);
    
    cout << num << "的质因子为：";
    for (int i = 0; i < factors.size(); i++) {
        cout << factors[i] << " ";
    }
    
    return 0;
}