Question

在c语言环境中，系统输出密码时如何用*代替屏幕上显示的密码？应该用怎样的程序段？

Answer 1

C语言的太没挑战性了
汇编语言的的
.486
DATA SEGMENT USE16
SECRET1 DB '12345'
SECRET2 DB 7 DUP(?)
MESG1 DB 'Please enter the secret!You have $'
NUM DB 33H
DB ' times!',0DH,0AH,'$'
MESG2 DB 0DH,0AH,'The secret is wrong!',0DH,0AH,'$'
MESG3 DB 0DH,0AH,'Welcome!',0DH,0AH,'$'
DATA ENDS

CODE SEGMENT USE16
ASSUME CS:CODE,DS:DATA,ES:DATA
BEG: MOV AX,DATA
MOV DS,AX
MOV ES,AX
AGAIN:
CMP NUM,30H
JE EXIT
MOV AH,9
MOV DX,OFFSET MESG1
INT 21H
MOV AH,9
MOV DX,OFFSET NUM
INT 21H
MOV BX,OFFSET SECRET2
NEXT1: MOV AH,7
INT 21H
MOV [BX],AL
INC BX
CMP AL,0DH
JE NEXT2
MOV AH,2
MOV DL,'*'
INT 21H
CALL NEXT1
NEXT2: MOV SI,OFFSET SECRET1
MOV DI,OFFSET SECRET2
MOV CX,5
CLD
REPE CMPSB
JNZ WRONG
JMP RIGHT
WRONG: MOV AH,9
MOV DX,OFFSET MESG2
INT 21H
DEC NUM
CALL AGAIN
RIGHT: MOV AH,9
MOV DX,OFFSET MESG3
INT 21H
EXIT: MOV AH,4CH
INT 21H
CODE ENDS
END BEG

Answer 2

网上搜的，你试试

追答

int main()
{
int n,p;
char ch,acnt[256],pwd[256];
scanf("%d",&n);
while(n--)
{
system("cls");//清屏
p=0;
puts("请输入账号：");
scanf("%s%*c",acnt);
puts("请输入密码：");
while((ch=getch())!='\r')//判断是否是回车
{
if(ch==8)//实现backspace键的功能，其中backspace键的ascii码是8
{
putchar('\b');
putchar(' ');
putchar('\b');
if(p>0)//最多只能删到没有字符
p--;
}
if(!isdigit(ch)&&!isalpha(ch))//判断是否是数字或字符
continue;
putchar('*');//在屏幕上打印星号
pwd[p++]=ch;//保存密码
}
pwd[p]=0;//结束字符串
printf("\n账号：\n%s\n密码：\n%s\n",acnt,pwd);
p=0;
system("pause");
}
return 0;
}

#include
#include
#define MAX_PSD_LEN 20
void main()
{
char PassWord[MAX_PSD_LEN],*p=PassWord,ch;
int count=0;
printf("请输入登陆密码：");
ch=getch();
while(ch!=13&&count='A')||(ch='a')||(ch=' '))
{
printf("*");
count++;
*p=ch;
p++;

}
ch=getch();
}
PassWord[count]=0;
printf("\n%s\n",PassWord);

}

这个没问题，我试过