Having major trouble figuring out this code!!!!!!!!

[josh2two]

I can't figure out how to do this code, Please help

Enter a string: hello
After capitalizing the first letter of this string it becomes: Hello
After capitalizing the last letter of this string it becomes HellO
After adding three to the first letter of this string it becomes KellO
After swapping the first and last letters of this string it becomes OellK

[teknomage1]

Um that doesn't look like code to me. Is that the output you are supposed to write a program to produce? Remember char variables in C/C++ can be treated as ints.

[Locutus]

C or C++?

Also, you probably want to be a bit more specific as to what you've got so far and what you still need.

[Locutus]

Originally Posted by teknomage1

Remember char variables in C/C++ can be treated as ints.

Carefull there... in a typical C++ implementation these days a char is 8 bits wide while an int is 32 bits. And that's not even guaranteed to be true.

[teknomage1]

True but I'm assuming he's working on an exercise using char* arrays and is supposed to use addition functions to manipulate the characters. Since he's only adding 3, I doubt the variable will overflow. :-)

[Locutus]

Originally Posted by teknomage1

True but I'm assuming he's working on an exercise using char* arrays and is supposed to use addition functions to manipulate the characters. Since he's only adding 3, I doubt the variable will overflow. :-)

Adding only one can be enough to overflow a variable Not that that is necessarily a bad thing for this particular excercise. Although you probably don't want \0 characters in the middle of a string, the post doesn't really say what to do when you add 3 to for example 'z'. My point would be that you should simply treat chars as chars.

C uses zero terminated arrays of chars, in C++ std::string is preferred. In C++ you'd use C++ streams with std::cin to get input, in C you have to read stuff from stdin, etc.

Just need more info.

[Valmont]

Josh2two, experiment with this:

#include <iostream>
#include <string>

int main()
{
  std::string theWord = "hello";
  theWord[0] = theWord[0]+3;
  std::cout<<theWord<<std::endl;
  
  return 0;
}

[josh2two]

it has to do these operations to whatever the user enters:

THIS IS WHAT I HAVE SO FAR

char message[50];
cout<<"Enter a string: ";
cin>> message;
cout<<"After capitalizing the first letter of this string it becomes: ";
message[0] = toupper (message [0]);
cout<<message;
cout<<"\n""After capitalizing the last letter of this string it becomes: ";
cout<<message;
cout<<"\n""After adding three to the first letter of this string it becomes: ";
cout<<message;
cout<<"\n""After swapping the first and last letters of this string it becomes: ";
cout<<message<<"\n""\n";
system("PAUSE");
system("CLS");

[redhead]

Here is one in C

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define LENGTH 256

int main()
{
  char alphabet[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 
		     'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 
		     'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '\0'};
		     
  char message[LENGTH +1], temp;
  int i;
  printf("Enter a string: ");
  fflush(stdout);
  fgets(message, LENGTH, stdin);
  message[strlen(message) -1] = '\0'; /* remove '\n' from string */
  message[0] = toupper(message[0]);
  printf("After capitalizing the first letter of this string it becomes: %s\n",
	 message);
  message[strlen(message) -1] = toupper(message[strlen(message) -1]);
  printf("After capitalizing the last letter of this string it becomes: %s\n",
	 message);
  for(i=0; i < alphabet[i]; ++i)
    if(message[0] == alphabet[i])
      {
	message[0] = alphabet[(i+3)%strlen(alphabet)];
	break;
      }
  printf("After adding three to the first letter of this string it becomes: %s\n",
	 message);
  temp = message[0];
  message[0] = message[strlen(message) -1];
  message[strlen(message) -1] = temp;
  printf("After swapping the first and last letters of this string it becomes: %s\n",
	 message);
  return 0;
}

But since you're looking at C++, you might want to use some nifty string functions.

[josh2two]

thanks so much everyone, this is the final code

char alphabet[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '\0'};

char message[LENGTH +1], temp;
int i;
cout<<"Enter a string: ";
cin>>message;
message[0] = toupper(message[0]);
cout<<"After capitalizing the first letter of this string it becomes: "<< message<<"\n";
message[strlen(message) -1] = toupper(message[strlen(message) -1]);
cout<<"After capitalizing the last letter of this string it becomes: "<< message<<"\n";
for(i=0; i < alphabet[i]; ++i)
if(message[0] == alphabet[i])
{
message[0] = alphabet[(i+3)%strlen(alphabet)];
break;
}
cout<<"After adding three to the first letter of this string it becomes:"<< message<<"\n";
temp = message[0];
message[0] = message[strlen(message) -1];
message[strlen(message) -1] = temp;
cout<<"After swapping the first and last letters of this string it becomes:"<< message<<"\n";
system("PAUSE");
system("CLS");

[Locutus]

@redhead: I suppose it's a matter of style, but you could of course just do

char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";