File writing program append mode using Command Line Argument

Q : Write a program using command line parameters to append one text file to another text file.?

Answer : 

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

void main(int argc,char *argv[])

{

     FILE *infile,*outfi

le;

     char ch;

     if(argc>3)

     {

          printf("Only Source and file name is allowed");

          exit(1);

     }

     else

     {

          infile=fopen(argv[1],"r");

          if(infile==NULL)

          {

              printf("Source file opening error");

              exit(2);

          }

          else

          {

              outfile=fopen(argv[2],"a");

              if(outfile==NULL)

              {

                   printf("Unable to create destination file");

                   exit(3);

              }

              else

              {

                   while(1)

                   {

                        ch=fgetc(infile);

                        if(ch==EOF)

                             break;

                        fputc(ch,outfile);

                   }

                   printf("\nFile Copied Successfully");

              }

          }

          fclose(infile);

          fclose(outfile);

     }

}

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