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new to c++ __coverting uppercase to lowercase vice versa

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new to c++ __coverting uppercase to lowercase vice versa

Nov 13th, 2008

Write a program that will prompt the user to type in a series of characters. Input these characters into a c-string (char array). For each character, if it is a letter, toggle the case (upper to lower case, or lower to upper case). All other characters leave as is. Print out the string before and after.

and

I i've been use:

#include <cctype>

and

islower(), isupper(), tolower(), and toupper(), and maybe isalpha(). to the help the coding.

In the for loop, use this format:
for (i=0; arrayname[i]; i++)

any suggestion?

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Re: new to c++ __coverting uppercase to lowercase vice versa

Nov 13th, 2008

What have you done so far? We don't solve homeworks

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Re: new to c++ __coverting uppercase to lowercase vice versa

Nov 13th, 2008

Yes, you've collected all the tools you'll need. Now put them together in some actual code.

I kind of like your for loop - clever way you end it. Goes against my feeling that for loops should be controlled by the value of the counter, but it's more succinct than the equivalent while loop implementation.

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Re: new to c++ __coverting uppercase to lowercase vice versa

Nov 13th, 2008

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Originally Posted by vmanes

I kind of like your for loop - clever way you end it.

As do I. Which automatically makes me believe that it's part of the assignment given by the teacher

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Re: new to c++ __coverting uppercase to lowercase vice versa

Nov 14th, 2008

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Originally Posted by niek_e

As do I. Which automatically makes me believe that it's part of the assignment given by the teacher

okay i think i got it all together ..check this out..
and it is an assignment.... i was just asking for any input on it...
but here is my code and for the next guy who wants to use it .. i don't mind... in the end its all up to you weather you learn it or not...you might learn something new from it... do what ever you want with it.....

#include <iostream>
#include <cstring>
#include <cctype>

using namespace std;

int main ()
{
char letters[20];
char temp;
int i;
cout << "Pease enter characters " << endl;
cin >> letters;
for (i=0; letters[i]; i++)
{
if (isalpha(letters[i]))

{if (islower(letters[i]))
temp=toupper(letters[i]);
if (isupper(letters[i]))
temp=tolower(letters[i]);
cout << temp;
}
else
{temp=letters[i];
cout << temp;
}
}
cout << endl;
cin >> i;

return 0;
}

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Re: new to c++ __coverting uppercase to lowercase vice versa

Nov 14th, 2008

and how could i make it better? fancier or what ever.. i like to get a good grasp on this...

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Re: new to c++ __coverting uppercase to lowercase vice versa

Nov 14th, 2008

Here's code from something I was doing the other-night:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
string str = "I'm a fairy! abc xyz ABC XYZ";
int casechanged = 0;
 
cout << str;
    for(i = 0; i < str.length(); i++)
    {
          if(isUpper(str[i])) { str[i] = toLower(str[i]); casechanged = 1; }
          if(isLower(str[i]) && casechanged != 1) { str[i] = toUpper(str[i]);}
 
          casechanged = 0;
    }
    cout << str;
 
    for(i = 0; i < str.length(); i++)
    {
          if(isLower(str[i])) { str[i] = toUpper(str[i]); casechanged = 1; }
          if(isUpper(str[i]) && casechanged != 1) { str[i] = toLower(str[i]); }
 
          casechanged = 0;
    }
   cout << str;
string str = "I'm a fairy! abc xyz ABC XYZ";
int casechanged = 0;

cout << str;
    for(i = 0; i < str.length(); i++)
    {
          if(isUpper(str[i])) { str[i] = toLower(str[i]); casechanged = 1; }
          if(isLower(str[i]) && casechanged != 1) { str[i] = toUpper(str[i]);}
          
          casechanged = 0;
    }
    cout << str;
    
    for(i = 0; i < str.length(); i++)
    {
          if(isLower(str[i])) { str[i] = toUpper(str[i]); casechanged = 1; }
          if(isUpper(str[i]) && casechanged != 1) { str[i] = toLower(str[i]); }
          
          casechanged = 0;
    }
   cout << str;

The isLower/Upper(), and toUpper/toLower(), are my own functions I wrote, just replace them with the proper names of the ones you're using.

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Re: new to c++ __coverting uppercase to lowercase vice versa

Nov 14th, 2008

koool thanx

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Re: new to c++ __coverting uppercase to lowercase vice versa

Nov 14th, 2008

Here's your code, cleaned up and simplified a bit.

When posting code here, please use the tags
[code]
your code here
[/code]
This will better preserve your indenting, making the code easier to read.

You should adopt a consistent style of indenting, and use of curly braces. You're mixing styles, which hinders readability. Also use some blank spaces in a line between operators and operands. You're not charged by the byte.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream>
#include <cctype>
 
using namespace std;
 
int main ()
{
	char letters[20];
	int i;
 
	cout << "Pease enter characters " << endl;
	cin >> letters;
 
	cout << letters << endl; //assignment said display the original
 
	for ( i = 0; letters[i]; i++ )
	{
		if ( isalpha(letters[i] ) )
		{
			if ( islower(letters[i] ) )
				letters[i] = (char) toupper( letters[i] );
			else //we know it's a letter, and not lowercase
				letters[i] = (char) tolower( letters[i] );
		}
		//don't do anything to non-alpha
	}
 
	//display the whole string, not one char at a time in the loop
	cout << letters << endl;  //the changed version
 
	cout << endl;
 
	return 0;
}
#include <iostream>
#include <cctype>

using namespace std;

int main ()
{
	char letters[20];
	int i;

	cout << "Pease enter characters " << endl;
	cin >> letters;

	cout << letters << endl; //assignment said display the original

	for ( i = 0; letters[i]; i++ )
	{
		if ( isalpha(letters[i] ) )
		{
			if ( islower(letters[i] ) )
				letters[i] = (char) toupper( letters[i] );
			else //we know it's a letter, and not lowercase
				letters[i] = (char) tolower( letters[i] );
		}
		//don't do anything to non-alpha
	}

	//display the whole string, not one char at a time in the loop
	cout << letters << endl;  //the changed version

	cout << endl;

	return 0;
}