how do I read from a .txt file in C++

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1.50/5 (2 votes)

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C++

#include<iostream>
#include<string>


using namespace std;
char PrintCharacter(char);

char PrintCharacter(char sWord){
	 

char cAlp[]={"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"};
char cAl[]= {"YPLTAVKREZGMSHUBXNCDIJFQOWypltavkrezgmshubxncdijfqow"};       

for(int i=0;i<52;i++){
	if(sWord!=cAlp[i])
	continue;
	else
	cout << cAl[i];
}

}



int main(){
string sSent;
sSent = "How do I do this";

	int iLength = sSent.length();
	
	for(int iStart=0;iStart<ilength;istart++){>
		if(isalpha(sSent[iStart]))
		PrintCharacter(sSent[iStart]);
		else
		cout <<sSent[iStart];
		}

/* y p l t a v k r e z g m s h u b x n c d i j f q o w */		
 
}

in this code, im translating the sentence "How do I do this"
to Ruf tu E tu drec <--- in al bhedizers.

so my problem is that the sentence is in inside .cpp
we were tasked to make the sentence inside a .txt file then the program will read it and output in also in a .txt file.

is there a way to do that?? i read some on how but I dont understand how to apply it.
sorry for noob questions.

Posted 18-Feb-15 20:56pm

Reuben Cabrera

Updated 18-Feb-15 21:31pm

CPallini

v5

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Comments

Andy411 19-Feb-15 3:31am

Did you try something like https://duckduckgo.com/?q=reading+text+file+in+c%2B%2B

Richard MacCutchan 19-Feb-15 4:20am

That's a solution.

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CPallini · Answer 1 · 2015-02-18T23:50:00

You may use the std::getline[^] function, for the purpose, for instance, the following program tries to do it with the "foo.txt" file

C++

int main()
{
  ifstream ifs("foo.txt");
  while (ifs.good())
  {
    string line;
    getline(ifs, line);
    for (int n = 0; n < line.length(); ++n)
    {
      char c = line[n];
      if ( isalpha(c) )
        PrintCharacter(c);
      else
        cout << c;
    }
    cout << endl;
  }
}