Hi, I need urgent help for this program, sorry I am new to C and I got this code:

Code:
#include <stdio.h>

#define STRINGSIZE 100

void getString(char *string);
void reverseCase(char *string);
int numGraph(char *string);


int main()
{
   char string[STRINGSIZE];
   int count;
   char c;

   getString(string);
   printf("Entered string => %s", c);

   count = numGraph(string);
   printf("Number of graphic characters in string = %d\n", count);

   reverseCase(string);
   printf("Reverse case   => %s", c);

   return 0;
}

void reverseCase(char *string)
{
   /* Reverse the case of all alphabetic characters in the string.
       That is, all upper case characters become lower case and
       all lower case become upper case.
   */
	char c;

 	 while((c = getchar()) != EOF)
   	 putchar(isupper(c) ? tolower(c) : toupper(c));
}

int numGraph(char *string)
{
   /* Calculate the number of printable graphic characters in the
      string.
   */

   int count;

   while (string != '\0')
   {
      if (isgraph((int) *string)) count++;
   }
   return count;
}

void getString(char *string)
{
   char c; 
   printf("Please enter a string to process\n");
   scanf("%s", c);
   fgets(string, STRINGSIZE, stdin);
}
What I am trying to achieve is for the program to first ask me to input a string, then I need the program to show me the string I entered, count the number of characters entered and then convert the string to upper case or vice versa depending on the string I entered.

This code is for some reason throwing me a runtime error, I am not sure what I am doing wrong. Any help will be appreciated. Thanks.