Thread: two dimensional character array

error - arithmetic on pointer to an incomplete type - on statements like this...

string[i][1] = c;
message[j] != string[k][0]

string is a two dimensional character arrays, [string (33,2)] message is a one dimension character array. any and all help would be appreciated.

edit: i can post entire code if necessary

string[i][1] = c;

Since you've stated that 'string', which is a reserved keyword by the way, and you shouldn't use that name, is a two dimensional character array, and unless you have a char variable declared as c, your assignment is incorrect.

What is c? Is it a variable, or are you trying to assign the letter c to that spot in the array? If it isn't a variable, then you need to be doing:

array[i][1] = 'c';

Otherwise, without knowing what exactly is taking place, we can only guess.

[edit]

message[j] != string[k][0]

Furthermore, what is this line? Is this line in an if statement for comparison? If not, this line is also invalid.

Valid:

if( array[x] != array2[y] )

Invalid:

array[x] != array2[y];


The operator != cannot be used for assignment. It is strictly used for comparisons.
[/edit]

Quzah.

i've renamed the array from 'string' to 'key'

c is a char variable

and the != was part of an if statement...

full code:

Code:

#include<stdio.h>
#include<ctype.h>
#include<string.h>

   void readCode(char [][]);
   void encode(char [][]);
   void decode(char [][]);

    int main()
   {
      char c, key[33][2] = { {'A','0'}, {'B','0'}, {'C','0'}, {'D','0'}, 
      {'E','0'}, {'F','0'}, {'G','0'}, {'H','0'}, {'I','0'}, {'J','0'}, 
      {'K','0'}, {'L','0'}, {'M','0'}, {'N','0'}, {'O','0'}, {'P','0'}, 
      {'Q','0'}, {'R','0'}, {'S','0'}, {'T','0'}, {'U','0'}, {'V','0'}, 
      {'W','0'}, {'X','0'}, {'Y','0'}, {'Z','0'}, {' ','0'}, {'.','0'}, 
      {',','0'}, {'?','0'}, {'!','0'}, {';','0'}};
   
   
      readCode(key);
   
      printf("\n\n     MENU\n\n");
      printf("C    Change Code\n");
      printf("E    Encode\n");
      printf("D    Decode\n");
      printf("Q    Quit\n"); 
      
      scanf("%c",c);
      toupper(c);
   	
      switch(c)
      {
         case 'C':
            readCode(key);
            break;
         case 'E':
            encode(key);
            break;
         case 'D':
            decode(key);
            break;
         case 'Q':
            printf("Goodbye\n");
            break;
      }
   
      return 0;
   }
   
	
    void readCode(char key[][])
   {
      char c, code[33];
      int  i = 0;
      
      printf("Enter the code, you must enter 32 unique characters on one line\n");  
      
      for(i = 0; (c = getchar()) != '\n'; i++)
           key[i][1] = c;
             
   }
   
    void encode(char key[][])
   {
      char c, message[100];
      int i = 0, j = 0, k = 0;
   
      printf("Enter the string to be encoded, press enter when finished\n");
      for(i = 0; (c = getchar()) != '\n'; i++)
         message[i] = c;  
      
      printf("Encoded Message\n");
   	
      for (j = 0; j < i; j++)
      {
      
         while (message[j] != key[k][0])
            k++;
      	
         putchar(key[1][k]);
         k = 0;
      }
      printf("\n");
   }
   
    void decode(char key [][])
   {
      char c, message[100];
      int i = 0, j = 0, k = 0;
   
      printf("Enter the string to be decoded, press enter when finished\n");
      for(i = 0; (c = getchar()) != '\n'; i++)
         message[i] = c;  
      
      printf("Decoded Message\n");
   	
      for (j = 0; j < i; j++)
      {
      
         while (message[j] != key[k][1])
            k++;
      	
         putchar(key[0][k]);
         k = 0;
      }
      printf("\n");
   
   }

errors are in bold, but kinda hard to see