#include<iostream> #include<fstream> #include<string> #include<cstdlib> //#include"in_file" //#include"out_file"

using namespace std;

int main() { ofstream outfile; ifstream infile; infile.open("income.com"); outfile.open("tax.out"); if(!outfile) { cerr<<"error:unable to open output file!\n"; return -2; } if(!infile) { cerr<<"error:unable to open input file!\n"; return -1; }

string word; while(infile>>word) outfile<<word<<' '; infile.close(); outfile.close(); return 0; } 运行时总是说 unable to open input file 各位可否告诉我是怎么回事呢?

是因为你那个文件扩展名系统不识别，要写实际中存在的扩展名，帮你搞定了，自己运行一下！ #include<iostream> #include<fstream> #include<string>

using namespace std;

int main() { ofstream outfile; ifstream infile;

infile.open("income.txt"); if(!infile) { cerr<<"error:unable to open input file!\n"; return -1; }

outfile.open("tax.txt"); if(!outfile) { cerr<<"error:unable to open output file!\n"; return -2; } string word; while(infile>>word) { outfile<<word<<' '; cout<<word<<' '; } cout<<endl; infile.close(); outfile.close();

return 0; }