计算一系列整数的和
问题描述 对于给定的一系列整数，要求计算它们的和
输入说明 输入数据文件有多行，每行上可能有0个，一个或多个整数，直到文件结束
输出说明 输出数据的个数、逗号、空格、总和
输入样例
15  42

51
303
755

输出样例
5， 1166

好吧， 应该罚你看书

#include <iostream>
using namespace std;

int main()
{
    int count = 0, sum = 0;
    int num;
    while (cin >> num) {
        ++count;
        sum += num;
    }
    cout << count << ',' << ' ' << sum;
}

我来拿个分，虽然你这是作业贴

行万里路读万卷书。

     1    #include <iostream>
     2    #include <fstream>
     3    #include <string>
     4    #include <iterator>
     5    using namespace std;
     6   
     7    void add(string &sum, const string &str)
     8    {
     9        size_t flag = 0;//进位标志
    10        size_t tmp, i;
    11        size_t sizeSum = sum.size();
    12        size_t sizeStr = str.size();
    13   
    14        for (i = 0; i<sizeSum && i<sizeStr; ++i)
    15        {
    16            tmp = (sum[sizeSum - i - 1] - '0') + (str[sizeStr - i - 1] - '0');
    17            //sum[sizeSum - i - 1] = '0' + tmp%10 + flag;
    18            sum.replace(sizeSum - i - 1, 1, (string() + static_cast<char>('0'+tmp%10+flag)));
    19            flag = tmp/10;
    20        }
    21   
    22        if (sum.size() == i && str.size() > i)
    23        {
    24            for(; i < str.size(); ++i)
    25            {
    26                tmp = str[sizeStr - i - 1] - '0' + flag;
    27                sum.insert(0, (string() + static_cast<char>('0'+tmp%10)).c_str());
    28                flag = tmp/10;
    29            }
    30        }
    31        else if (sum.size() > i && str.size() == i)
    32        {
    33            for (; i < sum.size(); ++i)
    34            {
    35                tmp = sum[sizeSum - i - 1] - '0' + flag;
    36                //sum[sizeSum - i - 1] = '0' + tmp%10;
    37                sum.replace(sizeSum - i - 1, 1, (string() + static_cast<char>('0'+tmp%10)));
    38                flag = tmp/10;
    39            }
    40        }
    41   
    42    //    1 == flag ? sum.insert(0, (string() + static_cast<char>('0'+flag)).c_str()): 0==0;
    43        if (1 == flag)
    44        {
    45            sum.insert(0, (string() + static_cast<char>('0'+flag)).c_str());
    46        }
    47    }
    48   
    49    int main(int argc, char **argv)
    50    {
    51        if (2 != argc)
    52        {
    53            cout << string("error msg!") << endl;
    54            return -1;
    55        }
    56        string strFile(argv[1]);
    57       
    58        if (strFile.size() == 0)
    59        {
    60            cout << string("error file msg!") << endl;
    61            return -2;
    62        }
    63   
    64        ifstream fin(strFile.c_str());
    65        istream_iterator<string> beg(fin), end;
    66        string sum, tmp;
    67        int i = 0;
    68   
    69        while (beg != end)
    70        {
    71            ++i;
    72            tmp = *beg;
    73            add(sum, tmp);
    74            ++beg;
    75        }
    76        cout << "sum = " << sum << endl;
    77        cout << "i = " << i << endl;
    78   
    79        return 0;
    80    }