Problems Outputting File Data To Text File

I'm having problems outputting the information inside case 2, this piece of code here have the information show up in the txt file.

Code:

for (i=0;i<26;i++){//Displaying The Letter/Number Comination in Alphabetical Order
                printf("%c %d\n", codeLetter[i],codeNumber[i]);

Heres everything

Code:

#include <stdio.h>
#include "string.h"//Includes


void addCode(char, int,char[],int[]);//Prototypes
int getLetterIndex(char letter);
char letterToUpper(char letter);




int main (void)//Beginning Main Function
{


    int input=0;//Declaring Variables
    char codeLetter[26] = {'\0'};
    int codeNumber[26]={0};
    char temp;
    int tempNumber;
    int index = 0;
    int i;
    int quit=1;
    int pass; 
    char letter;




    while (quit != 0){//Start While Loop
        printf("************************************************************\n");//Menu
        printf("'1' = Enter CODE/UNIT Combination\n'2' = Display The Contents of ALL CODE/UNIT Values Entered\n");
        printf ("'3' = Look Up Single Code\n'4' = Quit");
        printf("\n************************************************************\n");
        scanf("%d", &input);


        switch (input){//beginning switch
        case 1:
            fflush(stdin);
            printf("Please Enter CODE/UNIT Combination\n");
            scanf ("%c%d", &temp,&tempNumber);
            addCode(temp, tempNumber, codeLetter, codeNumber);//function


            break;


        case 2: 
              
            for (i=0;i<26;i++){//Displaying The Letter/Number Comination in Alphabetical Order
                printf("%c %d\n", codeLetter[i],codeNumber[i]);
            
    FILE * Output;
    Output = fopen("Output File.txt", "w");
    fprintf(Output, "%c %d", codeLetter[i],codeNumber[i]);
    fclose(Output);
    }//end for loop
            break;
        case 3:
            fflush(stdin);//Clearing Input Data
            
            printf("Please Enter The Letter You Want To Look Up\n");
            scanf ("%c", &letter);
            letter=letterToUpper(letter);//Forcing Letter Variable To Uppercase
            index=getLetterIndex(letter);
            printf("%c%d\n", letter, codeNumber[index]);//Displaying Letter and Number
            break;
        case 4:
            printf ("\nGoodbye\n");
            quit = 0;
            break;


        default:


            printf("\nThat is not a valid entry:\n"); 




        }//End Switch
        system ("pause");
    system ("cls");//Clears Screen
    
    }//end do while




    system ("pause");
    return 0;




} 


void addCode(char toAdd, int numAdd, char letter[],int numbers[]){//Function 1
    int index;


    toAdd=letterToUpper(toAdd);
    index = getLetterIndex(toAdd);
    letter[index]=toAdd;


    numbers[index]+=numAdd;


}
char letterToUpper(char letter){//Function 2


    if(letter>90){
        letter=letter-32;
    }
    return letter;


}
int getLetterIndex(char letter){//Function 3
    int index;
    letter=letterToUpper(letter);
    index=letter-65;
    return index;
}

Some issues first:

• Your indentation is a bit messy. Clean it up and you'll probably get more help.
• string.h is a standard include file. Use < > instead of " " when you #include it.
• fflush(stdin) is undefined behavior. Read Cprogramming.com FAQ > Why fflush(stdin) is wrong and Cprogramming.com FAQ > Flush the input buffer
• system("pause") and system("cls") are not portable. Read Cprogramming.com FAQ > Stop my Windows Console from disappearing everytime I run my program?.
• You should look into the toupper() function provided by the standard include file <ctype.h> instead of writing your own buggy one.
• getLetterIndex could be better written in one line as "return toupper(letter) - 'A';"

We need more information to debug this properly. What input are you giving it? What incorrect output do you get? What correct output should you get? You may be having trouble because scanf can pick up newlines and space characters with the %c specifier if you don't tell it to skip them, e.g. scanf(" %c"...). Note the space before the %c.