Printing an index question

I have project in my class where I have to print a "coded message". The user is to input numbers that represent an alphabet array, then I need to convert those numbers into the letters of the array. Any help would be greatful as I have been beating my head on my keyboard for a couple of days now. Here is my code:

Code:

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#include <stdio.h>


int main(void){
   
    char alphabet[] = "0ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    char entry[15];
    size_t i, j;
   
    printf("%s%25s\n", "Alpha Number", "Alpha Letter\n");
   
    for(i = 1; i < 53; ++i){
        printf("%12u%22c\n", i, alphabet[i]);
    }
   
    printf("Type a coded message.  Separate whole numbers with a comma:\n");
    scanf("%14s", entry);
   
    printf("%s%25s\n", "Alpha Number", "Alpha Letter\n");
   
    for(j = 0; j < 15; ++j){


   
    for(i = 1; i < 53; ++i){
       
            if(entry[j] == ','){
                ++entry[j];
            }
            if(alphabet[j] == entry[i]){
                printf("%12c%22u\n", entry[j], alphabet[entry[j]]);


            }//End IF
        }//End inner loop
        if(entry[j] == '\0'){
            j = 999;
        }//End if
    }//End outer loop
    printf("Your coded message is:\n%c", alphabet[entry[i]]);
}//End program

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Save us some time, and post up a coded message, and what the final output should be, and what your program is currently giving for that input.

That will help us zoom in on the problem easier.

Are you sure you understand the assignment? Because I have to say, this is one of the most useless assignments I've seen. User is forced to enter digits and commas as some kind of encoded message - except the encoding is only A-z as 1-52?

Anyway, assuming that's what you want to do.

Code:

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if(alphabet[j] == entry[i])

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You are comparing successive Alphabetical characters to your user-entered Digit characters. When will that ever be equal?
Is it your intention that if a user entered 1, that would map to 'A'? If so, you need to convert your string of integers and commas to a series of actual integers. Then you'd use the value as index to your alpha array.

Are you required to read the user input as a string? If not, I'd strongly recommend reading as integers into an array.

Also, don't printf string literals using conversion specifiers, just

Code:

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printf("Alpha Number          Alpha Letter\n";

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This assignment is based on one we did previously where the user is supposed to enter a character and the output would print two columns, the index number and the letter the user typed. My thought process was that I could just reverse the process, but I haven't figured that part out. The commas aren't required. User input as a string isn't required, the only requirement is that the user types a message using 1-52 and the output will be two columns one with the numbers entered, one with the associating letters, then the message the user typed.