文件的读写

    创建一个后缀名为txt的文件，并向该文件中写入一个字符串，保存起来。再打开该文件，读出文件中内容。

    其实这个是使用C语言提供的读写文件的API的应用，多多练习应该就会用了。代码如下：

#include <stdio.h>
#include <string.h>

int main(int argc, char *argv[])
{
  FILE *fp;
  char pathName[50], txt1[100] = {'\0'}, txt2[100] = {'\0'};
  int fileLen;
  printf("please type the path name of the file\n");
  scanf("%s",pathName);
  fp = fopen(pathName,"w");
  printf("please input a string to this file\n");
  scanf("%s",txt1);
  fileLen = strlen(txt1);
  fwrite(txt1, fileLen, 1, fp);
  fclose(fp);
  printf("the file has been saved\n");
  printf("the content of the file: %s is \n",pathName);
  fp = fopen(pathName, "r");
  fread(txt2, fileLen, 1,fp);
  printf("%s\n",txt2);
  return 0;
}