#include<stdio.h>
#include<stdlib.h>
#include<graphics.h>
#include<conio.h>
#include<dos.h>

void getstr(int x,int y,char *str)
{
    int key;
    char ch;
    char s[2];
    int i=0;
    s[1]='\0';
    setfillstyle(SOLID_FILL,WHITE);
    setcolor(LIGHTGRAY);
    outtextxy(x+i*8,y,"_");
    while((key=getch())!=13)
    {
        if((key==8)||(key==75))
        {
            if(i>0)
            {
                i--;
                bar(x+i*8,y,x+(i+2)*8-1,y+8);
                outtextxy(x+i*8,y,"_");
            }
        }
        else
            if(ch=(char)(key&0x00ff))          //调试时，此处显示错误，但就是不白
            {
                str[i]=ch;
                s[0]=ch;
                bar(x+i*8,y,x+(i+1)*8-1,y+9);
                setcolor(LIGHTGRAY);
                outtextxy(x+i*8,y,s);
                outtextxy(x+(i+1)*8,y,"_");
                i++;
            }
            else
            {
                sound(1000);
                delay(100);
                nosound();
            }
    }
    str[i]='\0';
    setcolor(WHITE);
    outtextxy(x+i*8,y,"_");
}


void main()
{
    int gd=DETECT;
    int gm;
    char *str1;
    initgrah(&gd,&gm," ");
    setbkcolor(1);
    getstr(100,100,str1);
    getch();
    closegraph();
}

学习

头文件graphics.h好像是tc专有的，不能直接在其它编译器中使用。帮不了你哦