对磁盘文件的简单读写操作

#include <stdio.h>#include<string.h>int main() {    int i,ch;   char str[100];   FILE *fp;   fp=fopen("myfile","w");     //创建一个文件   while(1)     {  printf("input string:\n");      gets(str);      fprintf(fp,"%s",str);      printf("continue?");      ch=getchar();      if ((ch=='N')||(ch=='n'))    break;      getchar();     }   fclose(fp);   fp=fopen("myfile","r");    //开始读取文件   while(fscanf(fp,"%s",str)!=EOF)   {     for (i=0;str[i]!='\0';i++) {    if ((str[i]>='A') && (str[i]<='Z')) //大小写转换       str[i]+=32; }      printf("%s\n",str);            }   fclose(fp);   return 0;