#include <iostream>
#include <string>
#include <fstream>
#include<algorithm>
using namespace std;

int main(int argc, char* argv[])
{
    if (argc != 2)
    {
        cout << "usage: " << argv[0] << "filename" << endl;
        return 1;
    }
    ifstream ifs(argv[1]);
    if (!ifs)
    {
        cout << "Error: to open the file: " << argv[1] << endl;
        return 1;
    }
    string str;
    while (getline(ifs, str))
    {
        transform(str.begin(),str.end(),str.begin(),::toupper);
        cout<< str <<endl;
    }
    ifs.close();

    return 0;
}

------解决方案--------------------
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~/test> g++ -o toUpper toUpper.cpp  
~/test> ./toUpper od.txt
ABADFFAADD
DFDADDDAAF
ASDASDIOSS
这部分是写在哪里的啊?