Copying one or more than one file into one file

Copying one or more than one file into one file #include <stdio.h> void main(int argc,char *argv[]){ int i=0, is_copied=0; FILE *input, *output; char ch; clrscr(); if (argc>=3){ /* last file is the output file */ output=fopen(argv[argc-1],"w+"); if (output==NULL){ gotoxy(10,1); printf("Can't open output file :%s",argv[argc-1]); getch(); return; } /* input files */ for(i=1;i<argc-1;i++){ input=fopen(argv[i],"r"); if (input==NULL){ gotoxy(10,i+2); printf("Can't open input file :%s",argv[i]); } else{ /* writing from input file to output file */ rewind(input); while((ch=fgetc(input))!=EOF){ fprintf(output,"%c",ch); is_copied=1; } gotoxy(10,i+2); if (is_copied) printf("%s successfully copied into %s",argv[i],argv[argc-1]); else printf("%s can't copy into %s",argv[i],argv[argc-1]); is_copied=0; } fclose(input); } fclose(output); } else{ gotoxy(10,1); printf("please specifiy at least two file one source and another target"); } getch(); }