An incomplete C implementation of Linux cat command

cat.c

 #include <sys/types.h>
	 #include <sys/stat.h>
	 #include <fcntl.h>
	 #include <unistd.h>
	 #include<stdlib.h>
	 #include <stdio.h>
	 #define SIZE 50
	 
 int main(int argc,char* argv[]){

	
	 int inputFile;//input file  descriptor
	 int outputFile;//output file  descriptor 
	 char ch[SIZE];//buffer to store read characters
	 
	 if(argc==1)
	  {
	       perror("No input file");
	       exit(EXIT_FAILURE);
	  }
	    inputFile=open(argv[1],O_RDONLY);

	 if(argc==3){
	   	outputFile=open(argv[2],O_CREAT|O_RDWR|O_APPEND,S_IWUSR);
	} 
	 
	 else if(argc==2)
	      outputFile=1;
	 
	
	   while(read(inputFile,ch,1)!=0)
	    	
	    	
	    	  { write(outputFile,ch,1);
	    	
	    	}
	    	
	    	close(inputFile);
	       	close(outputFile);
	    	 
	    	
	    	 }