Thread: is this right way to use malloc.

i would like to ask if this is the right way to use malloc or if i am doing anything wrong.
i just turned the page about structures a few days ago in the book i am using.
thanks for the time to comment.

Code:

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

struct contents
{
	int chars;
	int digits;
	int others;
};
void PrintUsage(const char *progname);
int main(int argc, char** argv)
{
	int c;
	int i;
	int ch,digit,other;
	    ch=digit=other=0;

	FILE *fp;
	
	  if( argc == 1 )
	  {
		   PrintUsage(argv[0]);
		   exit(EXIT_FAILURE);
	  } 
		  
		  struct contents *count=malloc(sizeof(count));
		  
		  if(count == NULL)
		  { 
			 errno=EINVAL;
			 perror(argv[0]);
		        exit(1);
                 }
		  
		 for(i=1;i< argc;i++)
               {
	                if((fp=fopen(argv[i],"r")) == NULL)
	                {
                            errno=EINVAL;
		                    perror(argv[0]);
	                        exit(EXIT_FAILURE);
	                }

	              while((c=fgetc(fp))!= EOF)
	             {
		             switch(c)
		            {
		            	  case '1':case '2':case '3':case '4':case '5':
			              case '6':case '7':case '8':case '9':case '0':
			              digit++;  
				      count->digits++;
			              case ' ': case '\n': case '\t':
			              other++;
				     count->others++;
			              default:
			              ch++;
				     count->chars++;
		            }

             	}  
	/* it prints total of the files if more than 1 file is counted. for now its considered a feature :) */
   fprintf(stdout,"nchar %d ndigit %d nother %d %s\n",ch,digit,other,argv[i]);
   fprintf(stdout,"nchar %d ndigit %d nohter %d %s\n",count->chars,count->digits,count->others,argv[i]);

          } /* end for loop*/
		  
	     fclose(fp);
		free(count);
	     count=NULL;
	
	return 0;
}

void PrintUsage(const char *progname)
{
	fprintf(stdout," usage: %s [file]              \n"
	               "counts chars digits and others \n",progname);
}