Detailed Print – Computer Sir Ki Class

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Solved Problem#CPP#5039

Problem Statement - Displaying and counting lines starting with a certain character

Write a program to display the lines starting with character ‘A’ or ‘a’ in the file “PROG.TXT” that contains following text. Also display the count of such lines.

A programmer should always be hardworking.
For that matter everyone should be hardworking.
A programmer is always under pressure.
Yes! not everyone is always under pressure.

Solution

		 

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Run Output

A programmer should always be hardworking.
A programmer is always under pressure.
No. of lines starting with character A = 2

Solved Problem Understanding

ifstream ipfile(“PROG.TXT”,ios::in); //Opening the file using the ifstream class
if(!ipfile) {cout<<“Unable to open file”<<endl; return 1;} //Checking for presence of file
int c=0; //initilization of counter
char line[255]=””; //Initialixation of line as char array
while(!ipfile.eof()) {// Loop till end of file is reached
ipfile.getline(line,255); //Getting the whole line using the getline method of ifstream
if(line[0]==’a’ || line[0]==’A’)  { //Checking for character matching A or a
cout<<line<<endl; //Printing the line starting with A or A
c++; }//Increasing the counter
}
ipfile.close(); //Closing file
cout<<“No. of lines starting with character A = “<<c<<endl; 
Printing the Count of lines starting with A or a.

Notes

  • This code can be tested on your local system only once a file with given content is created with its name as PROG.TXT
  • It is always a good practice to check if the file has been opened properly. It will not open properly in many cases. One can reach the OS by returning an error to the operating system.
  • For DOS testing with TurboC environment, learners are advised to keep the input file in the BIN directory are the turboc program runs from there.