程序代码：

#include < stdio.h >
#include < string.h >
#include < stdlib.h >
void main( )
{
        char p[10];
        char password = "119";
        char time = 0;
        while ( time <=3 ){
                printf( "Enter password:\n" );
                scanf( "%s", p );
                if( strcmp( p,password ) == 0 ){
                    printf( "OK,Welcome\n" );
                    break;
                }
                else
                    time ++;
        }
        if( time == 3 )
            printf( "Who are you ?" );
        system( "pause" );
}