一键搞定：用C语言构建全能文件复制工具

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
  FILE *in, *out;
  char ch;
  if(argc!=3) {
    printf("You forgot to enter a filename.\n");
    exit(1);
  }
  //打开源文件
  if((in=fopen(argv[1], "rb"))==NULL) {
    printf("Cannot open source file.\n");
    exit(1);
  }
  //打开目标文件
  if((out=fopen(argv[2], "wb")) == NULL) {
    printf("Cannot open destination file.\n");
    exit(1);
  }
  /* 这段代码实际执行文件的逐字拷贝 */
  while(!feof(in)) {
    ch = getc(in);
    if(!feof(in)) putc(ch, out);
  }
  fclose(in);
  fclose(out);
  return 0;
}

运行结果：