C语言实现文件写入

1、首先打开VC++6.0

2、选择文件，新建

3、选择C++ source file 新建一个空白文档

4、先声明头文件

#include <stdio.h>

5、写上主函数

void main()

{

}

6、主要代码

FILE *infile,*outfile,*otherfile;

char input;

char inputs[10];  

int i=0;

infile = fopen("d:\\infile.txt","r+");//用fopen函数打开文件

outfile = fopen("d:\\outfile.txt","a+");//用fopen函数打开文件

if ( !infile )

printf("open infile failed....\n");

if ( !outfile)

printf("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);//死循环读出文件内容

printf("%c",input);

putc(input,outfile);//写入内容

i++;

if(input == '\n' || input == EOF)

break;

}

fclose(infile);

fclose(outfile);

scanf("%d",i);

7、运行结果