[TrancePants]

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


int main()
{
	char string[100];
	int c= 0, count[26] = {0};

	printf("Enter a string:\t", string);
	gets(string);

	while ( string[c] != '\0' )
    {

		if ( string[c] >= 'a' && string[c] <= 'z' )
            count[string[c]-'a']++;

		else if(string[c] >= 'A' && string[c] <= 'Z' )
            count[string[c]-'A']++;

	else
		printf("");

        c++;
    }

	for ( c = 0 ; c < 26 ; c++ )
	{
		if( count[c] != 0 )
		printf("%c : %d\n",c+'a',count[c]);
    }

 return 0;
}

This is the output I recive:


I need some help counting the Uppercase Letters./>

[TrancePants]

*******************EDIT***************

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


int main()
{
	char string[100];
	int c = 0, lower[26] = {0}, upper[26] = {0};

	printf("Enter a string:\t", string);
	gets(string);

	while ( string[c] != '\0' )
    {

		if ( string[c] >= 'a' && string[c] <= 'z' )
            lower[string[c]-'a']++;

		else if(string[c] >= 'A' && string[c] <= 'Z' )
            upper[string[c]-'A']++;

	else
		printf("");

        c++;
    }

	for ( c = 0 ; c < 26 ; c++ )
	{
		if( lower[c] != 0 )
		printf("%c : %d\n",c+'a',lower[c]);
    }
	for ( c = 0 ; c < 26 ; c++ )
	{
		if( upper[c] != 0 )
		printf("%c : %d\n",c+'A',upper[c]);
    }
 return 0;
}

I have created seperate arrays for the lower and uppercase letters and it worked!.

[infernorthor]

Just a few comments.

gets() is considered unsafe you should use fgets(string,[int size],stdin);

<ctype.h> has function like islower() and isupper() which could replace your if conditions.
you could #define your own as well.

This is just personal preference, but I think it makes it easier to assign a array lookup to a variable if is repeated.
So you would do

	while ( string[i] != '\0' )
    {
                char c = string[i];
		if ( islower(c) )
                      lower[c-'a']++;

		else if(isupper(c) )
                      upper[c-'A']++;

	       else
		       printf("");

               i++;
    }

[baavgai]

Glad you got it, but you really are trying too hard. If you simply count everything...

Also, you have some warnings and a gets.

Here's another approach:

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

int main() {
    char string[100];
    int c, counts[256] = {0};

    // error
    // printf("Enter a string:\t", string);
    printf("Enter a string:\t");
    // never, never, never, gets(string); 
    fgets (string, 100, stdin);

    while ( string[c] != '\0' ) { counts[string[c++]]++; }

    for (c = 'a'; c<='z'; c++ ) {
        if( counts[c] != 0 ) { printf("%c : %d\n",c, counts[c]); }
    }
    for (c = 'A'; c<='Z'; c++ ) {
        if( counts[c] != 0 ) { printf("%c : %d\n",c, counts[c]); }
    }
    return 0;
}

Alternately, you could have a single loop and print out the ones you like. However, since you're putting lower before upper, that would be awkward. You could also play with functions here, if you like.

Overall, good work. Happy programming.