How to solve the problem of #c++#?

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< div class =" aw - list - img > 关于#c++#的问题，如何解决？

< br / > as long as the third question, Set up a project to implement the use of namespaces and the topic of converting decimal to other bases

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darky123 注册会员
2023-02-27 17:14

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hexadecimal conversion output reference is as follows:


#include 
#include 
using namespace std;

int main()
{
    int n;
    cout << "请输入一个整数:";
    cin >> n;
    cout << "十进制:" << n << endl;
    cout << "八进制:" << setw(3) << setfill('0') << oct << n << endl;
    cout << "十六进制:0x" << hex << n << endl;
    return 0;
}

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cxiao007 注册会员
2023-02-27 17:14

with < br / >(1) namespace util. H

#ifndef _UTIL_H_
#define _UTIL_H_


namespace math
{
    int getNum(int n =1);
}

#endif // !_UTIL_H_

util.cpp

#include "util.h"

int math::getNum(int n)
{
    for (int k = n; k >= 1; k--)
    {
        int sum = 0;
        int t = k;
        while (t)
        {
            sum += t % 10;
            t /= 10;
        }
        if (k % sum == 0)
            return k;
    }
    return 1;
}

main.cpp

#include 
#include "util.h"
using namespace std;
using namespace math;


int main()
{
    int n;
    cout << "请输入一个正整数:";
    cin >> n;
    cout << math::getNum(n) << endl;
    return 0;
}