四则运算
| 这个作业属于哪个课程 | <a href="https://edu.cnblogs.com/campus/ahgc/AHPU-se-JSJ18/">软件工程</a> |
|----------------------- |------------------------------|
| 这个作业要求在哪里 | <a href="https://edu.cnblogs.com/campus/ahgc/AHPU-se-JSJ18/homework/11377">作业要求</a>|
| 这个作业的目标 | <能对需求进行分析并实现;编码格式规范;学习博客撰写> |
| 学号 | <3180701304> |
<p></p><div class="toc"><div class="toc-container-header">目录</div><ul><li><a href="#题目要求">题目要求</a></li><li><a href="#函数说明">函数说明</a><ul><li><a href="#分数结构体">分数结构体</a></li><li><a href="#找公约数">找公约数</a></li><li><a href="#分数约分">分数约分</a></li><li><a href="#加法">加法</a></li><li><a href="#减法">减法</a></li><li><a href="#乘法">乘法</a></li><li><a href="#除法">除法</a></li><li><a href="#主函数">主函数</a></li></ul></li><li><a href="#运行截图">运行截图</a><ul><li><a href="#加法">加法</a></li><li><a href="#减法">减法</a></li><li><a href="#乘法">乘法</a></li><li><a href="#除法">除法</a></li></ul></li><li><a href="#小结">小结</a></li><li><a href="#源码">源码</a></li></ul></div><p></p> | |
<h1 id="题目要求">题目要求</h1> | |
<p>写一个能自动生成小学四则运算题目的程序,然后在此基础上扩展:</p> | |
<p>1)除了整数以外,还要支持真分数的四则运算,例如:1/6+1/8=7/24</p> | |
<p>2)程序要求能处理用户的输入,判断对错,累积分数</p> | |
<p>3)程序支持可以由用户自行选择加、减、乘、除运算</p> | |
<p>4)使用-n参数控制生成题目的个数,例如Myapp.exe -n 10,将生成10个题目</p> |
<h1 id="函数说明">函数说明</h1> | |
<h2 id="分数结构体">分数结构体</h2> | |
<pre><code>typedef struct //定义分数结构体 | |
{ | |
int up, down; | |
}fraction; | |
</code></pre> | |
<h2 id="找公约数">找公约数</h2> | |
<pre><code>int gcd(int a, int b) //最大公约数 | |
{ | |
if (b == 0) return a; //辗转相除法 | |
return gcd(b, a % b); | |
} | |
</code></pre> | |
<h2 id="分数约分">分数约分</h2> | |
<pre><code>void yuefen(int &a, int &b,int flag) //分数约分,并自动进行输出,用flag标志答案,答案不输出 | |
{ | |
int d = gcd(abs(a), abs(b)); | |
a /= d; | |
b /= d; | |
if (flag == 0) { | |
if (b == 1)printf("%d", a); | |
else printf("%d/%d", a, b); | |
} | |
} | |
</code></pre> | |
<h2 id="加法">加法</h2> | |
<pre><code>void add(int num,fraction fraans[],int ans[]) //加法题目生成及运算 | |
{ | |
int a, b, up1, down1, up2, down2,flag=0; | |
for (int i = 0; i <=num / 2; i++) //整数部分 | |
{ | |
unsigned int times = (unsigned int)time(0); //生成随机数 | |
srand(times * (i + 1)); | |
a = rand() % 10 + 1; | |
b = rand() % 10 + 1; | |
ans[i] = a + b; | |
printf("%d.%d+%d\n", i+1, a, b); //输出整数题目 | |
} | |
for (int i = num/2+1; i < num; i++) //分数部分 | |
{ | |
unsigned int times = (unsigned int)time(0); | |
srand(times * (i + 1)); | |
up1 = rand() % 10 + 1; | |
down1 = rand() % 10 + 1; | |
up2 = rand() % 10 + 1; | |
down2 = rand() % 10 + 1; | |
printf("%d.", i + 1); | |
yuefen(up1, down1,flag); | |
printf("+"); | |
yuefen(up2, down2,flag); | |
printf("\n"); //将随机生成的分数进行约分后再输出 | |
fraans[i].up = up1 * down2 + up2 * down1; | |
fraans[i].down = down1 * down2; | |
flag = 1; //用flag标志答案,对答案不进行输出 | |
yuefen(fraans[i].up, fraans[i].down,flag); | |
flag = 0; | |
} | |
} | |
</code></pre> | |
<h2 id="减法">减法</h2> | |
<pre><code>void subtract(int num, fraction fraans[], int ans[]) //减法题目生成及运算 | |
{ | |
int a, b, up1, down1, up2, down2,flag=0; | |
for (int i = 0; i <= num / 2; i++) | |
{ | |
unsigned int times = (unsigned int)time(0); | |
srand(times * (i + 1)); | |
a = rand() % 10 + 1; | |
b = rand() % 10 + 1; | |
ans[i] = a - b; | |
printf("%d.%d-%d\n", i, a, b); | |
} | |
for (int i = num / 2 + 1; i < num; i++) | |
{ | |
unsigned int times = (unsigned int)time(0); | |
srand(times * (i + 1)); | |
up1 = rand() % 10 + 1; | |
down1 = rand() % 10 + 1; | |
up2 = rand() % 10 + 1; | |
down2 = rand() % 10 + 1; | |
printf("%d.", i + 1); | |
yuefen(up1, down1, flag); | |
printf("-"); | |
yuefen(up2, down2, flag); | |
printf("\n"); | |
fraans[i].up = up1 * down2 - up2 * down1; | |
fraans[i].down = down1 * down2; | |
flag = 1; | |
yuefen(fraans[i].up, fraans[i].down, flag); | |
flag = 0; | |
} | |
} | |
</code></pre> | |
<h2 id="乘法">乘法</h2> | |
<pre><code>void multiply(int num, fraction fraans[], int ans[]) //乘法题目生成及运算 | |
{ | |
int a, b, up1, down1, up2, down2,flag = 0; | |
for (int i = 0; i <= num / 2; i++) | |
{ | |
unsigned int times = (unsigned int)time(0); | |
srand(times * (i + 1)); | |
a = rand() % 10 + 1; | |
b = rand() % 10 + 1; | |
ans[i] = a * b; | |
printf("%d.%d*%d\n", i+1, a, b); | |
} | |
for (int i = num / 2 + 1; i < num; i++) | |
{ | |
unsigned int times = (unsigned int)time(0); | |
srand(times * (i + 1)); | |
up1 = rand() % 10 + 1; | |
down1 = rand() % 10 + 1; | |
up2 = rand() % 10 + 1; | |
down2 = rand() % 10 + 1; | |
printf("%d.", i + 1); | |
yuefen(up1, down1, flag); | |
printf("*"); | |
yuefen(up2, down2, flag); | |
printf("\n"); | |
fraans[i].up = up1 * up2; | |
fraans[i].down = down1 * down2; | |
flag = 1; | |
yuefen(fraans[i].up, fraans[i].down, flag); | |
flag = 0; | |
} | |
} | |
</code></pre> | |
<h2 id="除法">除法</h2> | |
<pre><code>void divide(int num, fraction fraans[]) | |
{ //除法题目生成及运算 | |
int up1, down1, up2, down2, flag = 0; | |
for (int i = 0; i < num; i++) | |
{ | |
unsigned int times = (unsigned int)time(0); | |
srand(times * (i + 1)); | |
up1 = rand() % 10 + 1; | |
down1 = rand() % 10 + 1; | |
up2 = rand() % 10 + 1; | |
down2 = rand() % 10 + 1; | |
printf("%d.(", i + 1); | |
yuefen(up1, down1, flag); | |
printf(")/("); | |
yuefen(up2, down2, flag); | |
printf(")\n"); | |
fraans[i].up = up1 * down2; | |
fraans[i].down = down1 * up2; | |
flag = 1; | |
yuefen(fraans[i].up, fraans[i].down, flag); | |
flag = 0; | |
} | |
} | |
</code></pre> | |
<h2 id="主函数">主函数</h2> | |
<pre><code>int main() | |
{ | |
char f = 'Y'; | |
while(f!='N'&&f!='n') | |
{ | |
fraction fraans[400], userfraans[400]; | |
int ans[100] = { 0 }, userans[100] = { 0 }; | |
int num, symbol, grade = 0; | |
printf("四则运算题目生成程序\n"); | |
printf("请选择符号,1,2,3,4对应加减乘除:"); | |
scanf_s("%d", &symbol); //用symbol标志用户选择的符号,1234对应加减乘除; | |
printf("请输入题目数量(最少为2,最大100):"); | |
scanf_s("%d", &num); | |
switch (symbol) //对应选择不同的算法 | |
{ | |
case 1:add(num, fraans, ans); break; | |
case 2:subtract(num, fraans, ans); break; | |
case 3:multiply(num, fraans, ans); break; | |
case 4:divide(num, fraans); break; | |
} | |
if (symbol != 4) //当用户选择的运算不为除法时,分别对整数和分数答案进行保存 | |
{ | |
for (int i = 0; i <= num / 2; i++) | |
{ | |
printf("第%d道题的答案为:", i + 1); | |
scanf_s("%d", &userans[i]); | |
} | |
for (int i = num / 2 + 1; i < num; i++) | |
{ | |
printf("第%d道题的答案为:", i + 1); | |
if (fraans[i].down == 1) | |
{ | |
scanf_s("%d", &userfraans[i].up); | |
userfraans[i].down = 1; | |
} | |
else | |
{ | |
scanf_s("%d/%d", &userfraans[i].up, &userfraans[i].down); | |
} | |
} | |
} | |
else //当用户选择为出发时,对用户输入的答案进行保存 | |
{ | |
for (int i = 0; i < num; i++) | |
{ | |
printf("第%d道题的答案为:", i + 1); | |
if (fraans[i].down == 1) | |
{ | |
scanf_s("%d", &userfraans[i].up); | |
userfraans[i].down = 1; | |
} | |
else | |
{ | |
scanf_s("%d/%d", &userfraans[i].up, &userfraans[i].down); | |
} | |
} | |
} | |
for (int i = 0; i <= num / 2; i++) //对用户输入的答案和答案进行对比,如果一致,得分+1 | |
{ | |
if (userans[i] == ans[i])grade++; | |
} | |
for (int i = num / 2 + 1; i < num; i++) | |
{ | |
if (userfraans[i].up == fraans[i].up && userfraans[i].down == fraans[i].down)grade++; | |
} | |
printf("grade=%d\n", grade); | |
printf("是否继续做题?(Y/N)"); | |
cin >> f; | |
if (f == 'Y')system("cls"); //清屏 | |
else return 0; | |
} | |
} |