C语言文件读写基本操作DEMO

#include <stdio.h>#include <process.h>int main(){FILE *infile;FILE *outfile;//FILE *otherfile;char input;//char buffer[10];int i=0;infile=fopen("d:\\infile.txt","r+");  /* r+ 以可读写方式打开文件，该文件必须存在。*//*a+ 以附加方式打开可读写的文件。若文件不存在，则会建立该文件，如果文件存在，*//* 写入的数据会被加到文件尾后，即文件原先的内容会被保留。 （原来的EOF符不保留）*/outfile=fopen("d:\\outfile.txt","a+");if(!infile){fprintf(stderr,"open infile failed...\n");}if (!outfile){fprintf(stderr,"open outfile failed...\n");}printf("*********************************************\n");printf("** This program is to show file operation! **\n");printf("** The input file is:                      **\n");printf("**                       d:\\infile.txt     **\n");printf("** The contents in this file is:           **\n");printf("\n");for (;;){input=fgetc(infile);printf("%c",input);putc(input,outfile);i++;if (/*input=='\n' || */input ==EOF){break;}}printf("\n");fclose(infile);fclose(outfile);system("pause");return 0;}