please expalin me detail these set of code spacially ofstream output(dest.c_str(

Question

please expalin me detail these set of code spacially ofstream output(dest.c_str());

what is mean by dest.c_str() i know dest is string but plz explain .c_str() in detail

and if there is any alternative easy way to write these code plese do it and explaine it

void Encrypt(string source, string dest, ostream& log)

{

ifstream input(source.c_str());

if (!input)

{

cout << "Unable to open source file ";

exit(1);

}

ofstream output(dest.c_str());

if (!output)

{

cout << "Unable to open dest file ";

exit(1);

}

log << "Encrypt " << source << " " << dest << endl;

char c;

c = input.get();

while(input.good())

{   

output.put(c+50);

c = input.get();

}

input.close();

output.close();

Explanation / Answer

`ofstream output(dest.c_str());` This function opens a file and output is the output stream of file, Now problem in `ofstream output(dest)` is type of `dest` is `string` but `ofstream` excepts file name only in char*. `c_str()` simply return the char* buffer pointer. I hope this will answer your question.

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