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#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h>
int rand_n(int, int, int);
int cal(float, float, float, char);
int main()
{
int seed = 0, i, score = 10, ct, correct = 0, fault = 0;
int max = 10, min = 0;
// 设置两个操作数的取值范围
float par1, par2, anwser;
char sign[4] = { '+', '-', '*', '/' }, f;
printf("欢迎使用Mr.X四则运算练习系统\n注：做除法时请保留6位小数\n");
printf("请输入题目个数\n");
scanf("%d", &i);
ct = i;
while (i--)
{
f = sign[rand_n(0, 3, seed++)];
par1 = rand_n(min, max, seed++);
while (1)
{
par2 = rand_n(min, max, seed++);
if (!par2&&f=='/')
continue;
else
break;
}
printf("%.0f%c%.0f=",par1, f, par2);
scanf("%f", &anwser);
if (cal(par1, par2, anwser, f))
correct++;
else
fault++;
}
printf
("\n训练结束！总共有%d道题目\n一题%d分，总分是%d分\n你做对了%d道题目\n做错了%d道题目\n总共得到了%d分\n\n欢迎下次使用！\n",
ct, score, score * ct, correct, fault, correct * score);
return 0;
}
int rand_n(int min, int max, int seed)
// 返回一个随机数，整数
{
srand((int)time(NULL) + seed);
return rand() % (max - min + 1) + min;
}
int cal(float x, float y, float z, char c)
{
int t;
t = fabs(x * y - z) <= (1e-6);
switch (c)
{
case '+':
if (x + y == z)
{
printf("回答正确！干得漂亮！\n");
return 1;
}
else
{
printf("非常遗憾，你做错了，正确答案是%.0f\n", x + y);
return 0;
}
break;
case '-':
if (x - y == z)
{
printf("回答正确！干得漂亮！\n");
return 1;
}
else
{
printf("非常遗憾，你做错了，正确答案是%.0f\n", x - y);
return 0;
}
break;
case '*':
if (x * y == z || (x - (int)x > 0 && t || y - (int)y > 0 && t))
{
printf("回答正确！干得漂亮！\n");
return 1;
}
else
{
printf("非常遗憾，你做错了，正确答案是%f\n", x * y);
return 0;
}
break;
case '/':
if ((y != 0) && (x / y == z))
{
printf("回答正确！干得漂亮！\n");
return 1;
}
else
{
printf("非常遗憾，你做错了，正确答案是%f\n",x/y);
return 0;
}
break;
default:
printf("本程序只支持四则运算！\n");
}
return 0;
}
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