#include <stdio.h>

Main() {

FILE *f;

F=fopen("filea.txt","w");

Fprintf(f,"abc");

Fclose(f); }

若文本文件filea.txt中原有内容为：hello，则运行以上程序后，文件filea.txt中的内容为

#include <stdio.h>

Main()

{ FILE *fp;int i,a[6]={1,2,3,4,5,6};

Fp=fopen("d2.dat","w+");

For(i=0;i<6;i++) fprintf(fp,"%d\n",a[i]);

Rewind(fp);

For(i=0;i<6;i++) fscanf(fp,"%d",&a[5-i]);

Fclose(fp);

For(i=0;i<6;i++) printf("%d",a[i]);

}

#include <stdio.h>

Main()

{

FILE *fp; int a[10]={1,2,3},i,n;

fp=fopen("d1.dat","w");

for(i=0;i<3;i++) fprintf(fp,"%d",a[i]);

fprintf(fp,"\n");

fclose(fp);

fp=open("d1.dat","r");

fscanf(fp,"%d",&n);

fclose(fp);

printf("%d\n",n);

}

程序的运行结果是

#include <stdio.h>

Main()

{ FILE *pf;

char *s1="China",*s2="Beijing";

pf=fopen("abc.dat","wb+");

fwrite(s2,7,l,pf);

rewind(pf); /*文件位置指针回到文件开头*/

fwrite(s1,5,1,pf);

fclose(pf);

}

以上程序执行后abc.dat文件的内容是

#include<stdio.h>

Main( )

{ FILE *fp;int k,n,a[6]={1,2,3,4,5,6};

Fp=fopen("d2.dat","w");

Fprintf(fp,"%d%d%d\n",a[0],a[1],a[2]);

Fprintf(fp,"%d%d%d\n",a[3],a[4],a[5]);

Fclose(fp);

Fp=fopen("d2.dat","r");

Fscanf(fp,"%d%d",&k,&n);printf("%d%d\n",k,n);

Fclose(fp);

}

程序运行后的输出结果是

#include <stdio.h>

Main( )

{ FILE *fp; int a[10]={1,2,3,0,0},i;

Fp=fopen("d2.dat","wb");

Fwtite(a,sizeof(int),5,fp);

Fwrite(a,sizeof(int),5,fp);

Fclose(fp);

Fp=fopen("d2.dat","rb");

Fread(a,sizeof(int),10,fp);

Fclose(fp);

For(i=0;i<10;i+ +) printf("%d",a[i] );

}

程序的运行结果是

#include <stdio.h>

Main()

{ FILE *fp;char str[10];

fp=fopen("myfile.dat","w");

fputs("abc",fp); fclose(fp);

fp=fopen("myfile.dat","a+");

fprintf(fp,"%d",28);

rewind(fp);

fscanf(fp,"%s",str);puts(str);

fclose(fp);

}

程序运行后的输出结果是

#include <stdio.h>

Main() {

FILE *fp;

Char ch;

Fp=fopen( "fname", "w" );

While( ( ch=getchar()) !='#' )

Fputc( __________ );

fclose(fp); }

#include <stdio.h>

Main() {

FILE *fp;

Long num=0;

Fp=fopen("fname.dat","r");

While( __________ ){

fgetc(fp); num++;}

Printf("num=%d\n",num);

Fclose( fp ); }

下面选项中，填入横线处不能得到正确结果的是