8.文件复制#include main(){ FILE *in, *out; char ch,infile[10],outfile[10]; scanf("%s",infile); scanf("%s",outfile); if ((in = ______ )== NULL) { printf("Cannot open infile.\n"); exit(0); } if ((out = fopen(outfile, "w"))== NULL) { printf("Cannot open outfile.\n"); exit(0); } while (!feof(in)) fputc(fgetc(in), out); fclose(in); ______ }