how do I use isalpha as a bool in an "if" statement?

[cdea06]

So the project is to write a program (for a beginners C class) that compares 2 words and see if there anagrams of each other. I'm about halfway through the program and it was working fine until i tried to add the IF STATEMENTS with isalpha. What I'm trying to do is say:
If the string entered is all letters then continue with the program. If not terminate.

What am I doing wrong and are there any other obvious mistakes in my code?

Thanks

/*
  Program assignment name: Anagrams

  Author:Christopher Deaver
*/

#include <stdio.h>
#include <string.h>
#include <ctype.h>
 
int main()
{
   char word1[100], word2[100];
   int count[26];

   int i, j;

   fputs("Enter the 1st word: ", stdout);
   fflush(stdout); 
   fgets(word1, sizeof word1, stdin);
		
   for (i=0; i<100; i++) 
   {
      if(isalpha(word1[i]))
      {				
	 word1[i] = toupper(word1[i]);
      }
      else;
      {
	 printf("The word you entered, does not contain only letter");
	 for(i=0; i<100; i++)
	    word1[i] =0;
	 return 0;
      }		
   }
					
   fputs("Enter the 2nd word: ", stdout);
   fflush(stdout); 
   fgets(word2, sizeof word2, stdin);
		
   for (j=0; j<100; j++) 
   {
      if(isalpha(word2[j]))
      {				
	 word2[j] = toupper(word2[j]);
      }
      else;
      {
	 printf("The word you entered, does not contain only letter");
	 for(j=0; j<100; j++)
	    word2[j] =0;
	 return 0;
      }		
	
   }	
	

   if (strlen(word1) != strlen(word2))
   {
      printf("The words are not anagrams.\n");
   }
	
   printf("word1 = %s\n", word1);  
   printf("word2 = %s\n", word2);  
	
}

[WaltP]

if (isalpha(charValue))
{
    // charValue is an alpha
}
else
{
    // charValue is not an alpha
}

Returns TRUE if charValue is A-Z or a-z
Returns FALSE if not.

[cdea06]

Actually here's the whole code I have so far:

#include <stdio.h>
#include <string.h>
#include <ctype.h>
 
int main()
{
   char word1[100], word2[100];
   int count[26];

   int i, j, k;

   fputs("Enter the 1st word: ", stdout);
   fflush(stdout); 
   fgets(word1, sizeof word1, stdin);
		
   for (i=0; i<100; i++) 
   {
      if(isalpha(word1[i]))
      {				
	 word1[i] = toupper(word1[i]);
      }
      else;
      {
	 printf("The word you entered, does not contain only letter");
	 for(i=0; i<100; i++)
	    word1[i] =0;
	 return 0;
      }		
   }
					
   fputs("Enter the 2nd word: ", stdout);
   fflush(stdout); 
   fgets(word2, sizeof word2, stdin);
		
   for (j=0; j<100; j++) 
   {
      if(isalpha(word2[j]))
      {				
	 word2[j] = toupper(word2[j]);
      }
      else;
      {
	 printf("The word you entered, does not contain only letter");
	 for(j=0; j<100; j++)
	 {
	    word2[j] =0;
	 }
	 return 0;
      }			
   }	
	
   if (strlen(word1) != strlen(word2))
   {
      printf("The words are not anagrams.\n");
      return 0;
   }
	
   for (k=0; k<26; k++) 
   {
      if (word1[k] >= 'A' && word1[k] <= 'Z')
      {
	 count[word1[k]-'A']++;
      }
      else
      {
	 printf("The words are not anagrams.\n");
	 return 0;
      }
   }

   for (k=0; k<26; k++) 
   {
      if (word2[k] >= 'A' && word2[k] <= 'Z') 
      {
	 if (count[word2[k]-'A'] == 0)
	 {
	    printf("The words are not anagrams.\n");
	    return 0;
	 }
	 count[word2[k]-'A']--;
      } 
      else 
      {
	 printf("The words are not anagrams.\n");
	 return 0;
      }
   }

   printf("The words are anagrams.\n");
   return 0;
}

[cdea06]

if (isalpha(charValue))
{
    // charValue is an alpha
}
else
{
    // charValue is not an alpha
}

Returns TRUE if charValue is A-Z or a-z
Returns FALSE if not.

I'm confused then. Why why wont it work the way I have it evaluating the char at word1?

[WaltP]

Try outputting the characters in hex just before the test, and which block was entered.

[cdea06]

Try outputting the characters in hex just before the test, and which block was entered.

I'm sorry I'm afraid I don't understand what you mean by outputting in HEX. I'm rather new at this so you my have to dumb it down.

[cdea06]

Try outputting the characters in hex just before the test, and which block was entered.

Never mind. I get it now. Thank you.