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# include "stdio.h"
# include "stdlib.h" //随机函数头文件//
# include "time.h" //时间函数头文件//
int add ( int j , int x , int y ) ; //加法计算//
void sub ( int j , int x , int y ) ; //减法计算//
int sum = 0 ; //记录得分//
int pd ( int result ) //*判断输入是否正确 正确 返回1 错误 返回-1*//
{ int n ;
scanf ( " %d " , & n ) ;
if ( result = = n )
return 1 ;
return - 1 ;
}
void jifen ( int result ) //根据错误次数记分，
{
if ( pd ( result ) = = 1 )
sum + = 10 ;
else
{
printf ( " \n 答案错误请重新输入: " ) ; //错一题 //
if ( pd ( result ) = = 1 )
sum + = 7 ;
else
{
printf ( " \n 答案错误请重新输入: " ) ; //错两题//
if ( pd ( result ) = = 1 )
sum + = 5 ;
else
printf ( " \n 答错三次请继续解答下一题: \n " ) ; //错三题//
}
}
}
int main ( )
{
int i , x , y , ch , z ;
srand ( time ( NULL ) ) ; //随机函数 产生不同的随机数//
printf ( " 小学生计算题 \n " ) ;
for ( i = 0 ; i < 10 ; i + + )
{
x = rand ( ) % 51 ;
y = rand ( ) % 51 ;
ch = rand ( ) % 2 ;
switch ( ch )
{
case 0 : z = add ( i + 1 , x , y ) ;
if ( z = = 1 ) //重新出一题//
i = i - 1 ;
break ;
case 1 : sub ( i + 1 , x , y ) ;
break ;
default :
printf ( " 系统出错 " ) ;
break ;
}
}
printf ( " 你的分数为:%d " , sum ) ;
if ( sum > = 90 & & sum < = 100 )
printf ( " SMART " ) ;
else if ( sum > = 80 )
printf ( " GOOD " ) ;
else if ( sum > = 70 )
printf ( " OK " ) ;
else if ( sum > = 60 )
printf ( " PASS " ) ;
else if ( sum > = 0 )
printf ( " TRY AGAIN " ) ;
else
printf ( " 系统错误 " ) ;
return 0 ;
}
int add ( int j , int x , int y )
{
int result ;
result = x + y ;
if ( result > 50 ) //判断是否超出范围 超出返回1//
return 1 ;
printf ( " %d:%d+%d= " , j , x , y ) ;
jifen ( result ) ;
return - 1 ;
}
void sub ( int j , int x , int y )
{
int result , t ;
if ( x < y ) //保证差大于0//
{
t = x ; x = y ; y = t ;
}
result = x - y ;
printf ( " %d:%d-%d= " , j , x , y ) ;
jifen ( result ) ;
}
