c/c++读写文件

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转自：http://blog.csdn.net/kingstar158/article/details/6859379/
转自：http://blog.csdn.net/dreamcs/article/details/9495303?locationNum=5

c++实现写文件：

  // writing on a text file   #include <fstream> using namespace std;   int main () {       ofstream out("out.txt");       if (out.is_open())       {           out << "This is a line.\n";           out << "This is another line.\n";           out.close();       }       return 0;   }  //结果: 在out.txt中写入：  This is a line.  This is another line

c++实现读文件：

 // reading a text file     #include <iostream.h>     #include <fstream.h>     #include <stdlib.h>     int main () {         char buffer[256];         ifstream in("out.txt");         if (! in.is_open())   {           cout << "Error opening file"; exit (1);        }         while (!in.eof() ) {             in.getline (buffer,100);             cout << buffer << endl;         }         return 0;     }     //结果 在屏幕上输出      This is a line.      This is another line

linux c实现写文件：

#include <stdio.h>  int main()  {          FILE * fp;          int i;          char * path="./testout.txt";          fp = fopen(path, "w");          if(fp == NULL)          {                  perror("open error");                  return 1;          }          char arr[5]={'l','i','n','u','x'};          for(i=0; i<5;i++)          {                  if(fputc(arr[i],fp) == EOF)                  {                          perror("fgetc error");                          return 1;                  }          }          printf("\nputc suceesful\n");          fclose(fp);          return 1;  //结果: 在testout.txt中写入：  linux}

linux c实现读文件：

#include <stdio.h>  int main()  {          FILE * fp;          int i;          char * path="./testout.txt";          int ch;          fp = fopen(path, "r");          if(fp == NULL)          {                  perror("open error");                  return 1;          }          printf("output data in test.txt\n");          for(i=0; i<5;i++)          {                  ch = fgetc(fp);                  if(ch == EOF)                  {                          perror("fgetc error");                          return 1;                  }                  else                  {                          printf("%c", (char)ch);                  }          }          printf("\nget suceesful\n");          fclose(fp);          return 1;  }  }//结果在终端打印出linux

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