Sign Printing
Posted in Lighted Signs on 03/06/2000 12:26 pm by admin
How to have a while loop read a line(s) from a file printing a specific line(s)?
My assignment asks for me to write a program that reads a file and that outputs every string containing the @ sign to a file. Where I'm running into trouble is with my while loop, it's only printing the @ sign and not the entire line that contains the @ sign. Thanks in advance.
I'm using the c++ language
Here's a C++ solution that should give you an idea of how it can be done:
#include
#include
using namespace std;
int main(int argc, char *argv[]) {
string file,line,p;
unsigned lineNum = 0;
cout << "Text file name : ";
getline(cin,file);
ifstream myfile(file.c_str());
if (myfile.is_open()) {
cout << "Search string : ";
getline(cin,p);
do {
getline(myfile,line);
if (myfile) {
++lineNum;
if (line.find(p) != string::npos) {
cout << file << ":" << lineNum;
cout << ":" << line << endl;
}
}
} while (myfile);
myfile.close();
} else {
cout << "error opening " << file << endl;
}
return(0);
}
Sample run:
$ ./myGrep
Text file name : myGrep.cpp
Search string : lineNum
myGrep.cpp:8: unsigned lineNum = 0;
myGrep.cpp:19: ++lineNum;
myGrep.cpp:21: cout << file << ":" << lineNum;
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