c/c++ 两种文件流用法

以删除空白行为例 

c中，一个字符一个字符串地读有点慢

#include<iostream> #include<string>using namespace std;int main() {string filename,outfile;cin >> filename;freopen(filename.c_str(), "r", stdin);outfile = "";outfile = filename.substr(0, filename.find(".", 0)) + "out"+ filename.substr(filename.find(".", 0));freopen(outfile.c_str(), "w", stdout);char t=' ';char pre = ' ';int i = 0;while (scanf("%c", &t)) {if (t == pre && t == '\n') {continue;}pre = t;printf("%c", t);if (i == 10)break;i++;}return 0; }

c++用了文件流，注意window里面换行是/r/n 

#include<iostream> #include<fstream> #include<string>using namespace std;int main() {string filename,outfile;ifstream file1;ofstream file2;cin >> filename;outfile = "";outfile = filename.substr(0, filename.find(".", 0)) + "out"+ filename.substr(filename.find(".", 0));file1.open(filename, ios::in);file2.open(outfile);int i = 0;char *s1 = new char[10000];while (!file1.eof()) {file1.getline(s1,'/r/n');if (strcmp(s1,"")) {file2 << s1<<"\n";}}return 0; }

 

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