readnums.cpp

来自「C++&datastructure书籍源码,以前外教提供现在与大家共享」· C++ 代码 · 共 34 行

#include <iostream>
#include <sstream>
#include <string>
using namespace std;

// illustrates use of input string streams

int main()
{
    string s;
    cout << "program computes averages of lines of numbers."  << endl;
    cout << "to exit, use end-of-file" << endl << endl;

    while (getline(cin,s))
    {   int total = 0;
        int count = 0;
        int num;

	    istringstream input(s);
        while (input >> num)
        {   count++;
            total += num;
        }
        if (count != 0)
        {   cout << "average of " << count << " numbers = "
                 << double(total)/count << endl;     
        }
        else
        {   cout << "data not parsed as integers" << endl;
        }
    }
    return 0;
}