C language file input and output

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#include<stdio.h>
int main()
{
    FILE *fin,*font;
    int b;
	fin=fopen("data.in","rb");     //定义一个输入文件
	font=fopen("data.out","wb");   //定义一个输出文件
	while(fscanf(fin, "%d", &b)==1)   //多实例输入
    {
        fprintf(font,"%d",b);
        fprintf(font,"\r\n");    //向输出文件中，存入换行
    }
}