"Project 4-programs to process C + + source Code" (3)

Problem Description:

(3) read into a C + + program, enter m, n two digits, the n lines of code from line m will be used as a comment (that is, precede these lines with "//"), the new program is saved to another. cpp file, and the program is displayed with a line number on the screen.

Code implementation:

#include <iostream> #include <cstdio> #include <cstring> #include <cstdlib> #include <    Fstream>using namespace Std;int Main () {FStream my1 ("Source.cpp");        if (!my1) {cerr<< "can ' t find source.cpp!\n";    Exit (1);    } ofstream my2 ("Newsource.cpp");        if (!my2) {cerr<< "can ' t write the newsource.cpp!\n";    Exit (1);    } int n,m;    printf ("Please enter M and N, will make the n lines of code from line m of the program be used as comments \ n");    scanf ("%d%d", &m,&n);    int i=1;    string S;        while (!my1.eof ()) {getline (my1,s);            if (i>=m&&i<= (m+n)) {my2<< "\ \";            my2<< "\";        } my2<<s<< ' \12 ';    i++;    } my1.close ();    My2.close ();    FStream in ("Newsource.cpp");        if (!in) {cerr<< "can ' t find newsource.cpp!\n";    Exit (1);    } printf ("\n\nwatch the newsource.cpp\n\n\n");        while (!in.eof ()) {getline (in,s);    cout<<s<< ' \12 '; } return 0;}

Operation Result:

"Project 4-programs to process C + + source Code" (3)