Fgetc() reads content from file

#include<stdio.h>
#include<stdlib.h>
int  main( )
{
    
	 FILE *fp;
	 char ch,filename[20];
	 printf("please input the filename you want to write:");
	 scanf("%s",filename);
	 if(!(fp=fopen(filename,"r")))
	 {
    
	 	 printf("cannot open the file!\n");
	 	 exit(0);
	 }
	
	 
	  while(ch!=EOF)
	 {
    
	 	 ch=fgetc(fp);
	 	 putchar(ch);
	 }
	 fclose(fp);

	 
}