Getting rid of array index brackets

This is a discussion on Getting rid of array index brackets within the C Programming forums, part of the General Programming Boards category; Just seeking advice. I have a program for homework that I completed and runs great. The program encrypts letters. A ...

  1. #1
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    Question Getting rid of array index brackets

    Just seeking advice. I have a program for homework that I completed and runs great. The program encrypts letters. A = Z, B = Y, C = X etc. and adds 3 to ascii value for digits. The only problem is that Array index brackets should NOT APPEAR ANYWHERE in my code EXCEPT when i referr to the argv contents.

    I am just seeking advice on how to go about removing the array index brackets, only line[] needs to be taken out. here is my code.

    Code:
    #include <stdlib.h>
    #include <stdio.h>
    #include <string.h>
     
    
    #include<ctype.h>
    
    #define MAX_SIZE 256
    
    char encryptAlpha  (char strChar);
    char encryptNumber (char strNum);
    
    int main (int argc, char *argv[])
    { 
    	int i;
    	char **mover;
    	FILE *fpIn;
    	FILE *fpOut;
    	char line[MAX_SIZE];
    	int size;
    	
    
    	for (i = 0; i < argc; i++)
    	{
    		printf("Argument %d is %s\n", i, argv[i]);
    	}
    	printf ("\n");
    	for (mover = argv; *mover != NULL; mover++)
    	{
    		printf("Argument pointed at by mover is %s\n", *mover);
    	}
    
    	if(!(fpIn = fopen(argv[1], "r" )) )
    	{
    		printf( "Error opening the input file.\n" );
    		exit(101);
    	}
    
    	if(!(fpOut = fopen(argv[2], "w" )) )
    	{
    		printf( "Error creating output file.\n" );
    		exit(101);
    	}
    
    	while(fgets(line, MAX_SIZE, fpIn))
    	{
    		size = strlen(line);
    		for (i = 0; i < size; i++)
    		{
    			if isalpha(line[i])
    				line[i] = encryptAlpha(line[i]);
    			else if ((line[i] >= '0') && (line[i] <= '9')) 
    				line[i] = encryptNumber(line[i]);
    		}
    	fprintf (fpOut, "%s", line);
    	}
    }
    
    char encryptAlpha (char strChar)
    {
    
    //	Local Definitions
    	char firstChar;
    	char lastChar;
    
    //	Statements
    	if ((strChar >= 'A') && (strChar <= 'Z'))
    	{
    		firstChar = 'A';
    		lastChar  = 'Z';
    		{
    			while ((firstChar <= 'M') && (lastChar >= 'N'))
    			{
    			if (strChar == firstChar)
    				strChar = lastChar;
    			else if (strChar == lastChar)
    				strChar = firstChar;
    
    			firstChar++;
    			lastChar--;
    			}
    		}
    	}
    
    	if ((strChar >= 'a') && (strChar <= 'z'))
    	{
    		firstChar = 'a';
    		lastChar  = 'z';
    		{
    			while ((firstChar <= 'm') && (lastChar >= 'n'))
    			{
    			if (strChar == firstChar)
    				strChar = lastChar;
    			else if (strChar == lastChar)
    				strChar = firstChar;
    
    			firstChar++;
    			lastChar--;
    			}
    		}
    	}
    return strChar;
    }// encryptAlpha
    
    char encryptNumber (char strNum)
    {
    	strNum += 3;
    
    return strNum;
    }

  2. #2
    and the hat of wrongness Salem's Avatar
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    arr[ i ] == *(arr + i)
    as any book should tell you.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  3. #3
    ATH0 quzah's Avatar
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    Code:
    #include<stdio.h>
    int main( void )
    {
        char array??(??) = "hello world";
        int x;
        
        for( x=0; array??(x??); x++ )
            putchar( array??(x??) );
            
        return 0;
    }
    It's always fun to see just what you can get away with by bending the wording of the question.


    Quzah.
    Hope is the first step on the road to disappointment.

  4. #4
    and the hat of wrongness Salem's Avatar
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    Ha Ha - nice one Quzah
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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