help with upper and lower case conversion

[B Williams]

I have written some code that will take in a string and print out the
reverse, but I also want it to check for upper and lower case and swap them.
Will someone assist me?

include <iostream>
using std::cout;
using std::cin;
using std::endl;

#include <string>
using std::string;

#include <algorithm>
using std::reverse;

int main() {
cout << "Enter a string.\n";
string name;
getline(cin, name);
reverse(name.begin(), name.end());
cout << name << '\n';

}

 

[Daniel T.]

I have written some code that will take in a string and print out the
reverse, but I also want it to check for upper and lower case and swap them.
Will someone assist me?

include <iostream>
using std::cout;
using std::cin;
using std::endl;

#include <string>
using std::string;

#include <algorithm>
using std::reverse;

int main() {
cout << "Enter a string.\n";
string name;
getline(cin, name);
reverse(name.begin(), name.end());
cout << name << '\n';

}

I'm not quite sure what you mean, could you provide some sample input
and output? For example should: AbCd turn into dCbA or DcBa?

 

[B Williams]

I'm not quite sure what you mean, could you provide some sample input
and output? For example should: AbCd turn into dCbA or DcBa?

If I enter BackDrop, and want the program to produce the output PORdKCAb

 

[Daniel T.]

If I enter BackDrop, and want the program to produce the output PORdKCAb

char swapCase( char c )
{
char result = tolower( c );
if ( islower( c ) )
result = toupper( c );
return result;
}

transform( name.begin(), name.end(), name.begin(), &swapCase );

 

[B Williams]

char swapCase( char c )
{
char result = tolower( c );
if ( islower( c ) )
result = toupper( c );
return result;
}

transform( name.begin(), name.end(), name.begin(), &swapCase );

Daniel,
where would that go in my code?

 

[David Harmon]

On Sun, 17 Dec 2006 20:56:22 -0500 in comp.lang.c++, "B Williams"

Daniel,
where would that go in my code?

You didn't really write any of it, did you?

 

[Daniel T.]

where would that go in my code?

I have to leave something for you to do. The swapCase function can
go anywhere outside of the main function (though if you put it after
'main' or in a different cpp file, you will need to declare it.) The
'transform' line needs to go somewhere between the 'getline' and 'cout
<< name'.

BTW, like 'reverse', 'transform' is a standard algorithm. Here is
another way to write swapCase:

char swapCase( char c ) {
return islower( c ) ? toupper( c ) : tolower( c );
}

 

[B Williams]

On Sun, 17 Dec 2006 20:56:22 -0500 in comp.lang.c++, "B Williams"


You didn't really write any of it, did you?

The reverse function is in the C++ standard library, so I didn't have to
write it, but I did know enough to get the syntax correct.

 

[B Williams]

I have to leave something for you to do. The swapCase function can
go anywhere outside of the main function (though if you put it after
'main' or in a different cpp file, you will need to declare it.) The
'transform' line needs to go somewhere between the 'getline' and 'cout
<< name'.

BTW, like 'reverse', 'transform' is a standard algorithm. Here is
another way to write swapCase:

char swapCase( char c ) {
return islower( c ) ? toupper( c ) : tolower( c );
}

Thanks Daniel, I got it to work. I have gotten so much from this NG over the
past year that I was attempting to help someone else. I'm no where the help
person yet.

 

[Yannick Tremblay]

Just a note to the OP:

Please be aware that the above or even the concept of "tolower" is
mainly only valid for basic US-ASCII in basic English.

If you eventually get a job in the software industry, please do not
ever make such a simplistic assumption. Billions of lines of code
have had to be rewritten because of assumption that the software would
never need to move outside the 7 bits ASCII character set.

If that's a course assignment, add a disclaimer to your submission.
If I were the teacher, I would add bonus points to whoever points this
out.

Yan