rewind(stdin)

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rewind(stdin)清除标准输入的按键缓冲区。

fflush()清除I/O流级别的缓冲区。

先看看Microsoft给出的例子：

#include <stdio.h>void main(void){int ch ;puts( "Input two or more chars. One is read now." );ch = getchar();putchar( ch );putchar( '\n' );puts( "The next char is taken from stdin." );ch = getchar( );putchar( ch );putchar( '\n' );rewind( stdin );puts( "Input two or more chars. One is read now." );ch = getchar();putchar( ch );putchar( '\n' );rewind( stdin );puts( "You must enter another char because of the rewind(stdin)" );ch = getchar( );putchar( ch );putchar( '\n' );}

再看：

int main(){char name[6] = {'\0'};char password[6] = {'\0'};int count = 0;while(1){count++;memset(name, 0, sizeof(name));memset(password, 0, sizeof(password));scanf("%5[^\n]", name);if(strcmp(name, "exit") == 0)break;//rewind(stdin);fflush(stdin);//getchar(); scanf("%5[^\n]", password);// rewind(stdin);fflush(stdin);//getchar();printf("name=[%s],password=[%s]\n",name,password);if(count>5)break;}return 0;}

若将fflush(stdin)改成rewind(stdin)测试效果相同。

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