Map string to alphanumeric keypad in C

If you haven't understood the title, here is an explanation:
    Input a string
    The program will tell you what buttons you need to press how many times in an alpha numeric keypad.

Example:
    input: blog
    output: 22 55 666 4

Logic?
    - Initialise a 2D array which holds values of all buttons.
    - Get the input string.
    - Loop through each elements in the array and check it with the 2D array.
    - The row index will tell you which button should be pressed.
    - The column index will tell how many times to press it.
    - In each loop concat the row index with the result string and display it !!

2D array for keypad:

The 2D initialisation:
 
    10 rows and max number of characters in a button : 4

    char keys[10][4]={ "XXXX",
                       "XXXX",
                       "abcX",
                       "defX",
                       "ghiX,
                       "jklX",
                       "mnoX",
                       "pqrs",
                       "tuvX",
                       "wxyz"
                     };

We mark the places which does not have a character with "X" (capital X)
like:
 Button 0 and 1 have no characters.
 Button 2,3,4,5,6,8 have only 3 characters and hence last character is an X.

The code:

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#include <stdio.h> #include<string.h> void main() { char str[20],result[100]=""; int i, j,k,l,count,isFound; char keys[10][4] = {"XXXX","XXXX","abcX","defX","ghiX","jklX","mnoX","pqrs","tuvX","wxyz"}; printf("Enter number of elements max(10):\t"); scanf("%d",&count); printf("\nEnter the string max(%d): \t",count); scanf("%s", str); strlwr(str); isFound = 0; for(i=0;i<count;i++) //loop through elements in array { for(j=2;j<10;j++) //loop through all buttons { for(k=0;k<4;k++) //loop through all char in the buttons { if (str[i] == keys[j][k]) { isFound=1; for(l = 0;l<=k;l++) //loop the number of times the button should be pressed { sprintf(result,"%s%d",result,j); } sprintf(result,"%s%c",result,' '); } else { isFound=0; } } if(isFound == 1) { break; } } } printf("\nButtons to be pressed: %s", result); getch(); }