题目描述:
从《构建之法》第一章的 “程序” 例子出发，像阿超那样，花二十分钟写一个能自动生成小学四则运算题目的命令行 “软件”，满足以下需求:
- 除了整数以外，还要支持真分数的四则运算，真分数的运算，例如：1/6 + 1/8 = 7/24
- 运算符为 +,-,×，÷
- 并且要求能处理用户的输入，并判断对错，打分统计正确率。
- 要求能处理用户输入的真分数， 如 1/2, 5/12 等
- 使用 -n 参数控制生成题目的个数，例如执行下面命令将生成10个题目Myapp.exe -n 10
| PSP2.1 | Personal Software Process Stages | Time (%) Senior Student(/hour) | Time (%)(/hour) |
| · Planning | 计划 | 2 | 1.5 |
| · Estimate | 估计这个任务需要多少时间 | 37 | 40 |
| · Analysis | 需求分析 (包括学习新技术) | 1 | 1 |
| · Coding Standard | 代码规范 | 0.5 | 0.5 |
| · Design | 具体设计 | 1.5 | 1 |
| · Coding | 具体编码 | 30 | 35 |
| · Test | 测试（自我测试，修改代码，提交修改） | 1 | 1 |
| Reporting | 报告 | 1 | 1 |
源代码:
#include<iostream>
#include<stdlib.h>
#include<time.h>
using namespace std;
int b = 0;
int maxNum(int i, int j)
{
int k;
if ((k = i % j) != 0)
{
maxNum(j, k);
}
else
return j;
}
int INT()
{
int x, y, z, t, m, n, c, r1, r2;
char r3[10], r4[10];
srand(time(NULL));
memset(r3, 0, sizeof(r3));
memset(r4, 0, sizeof(r4));
x = rand() % 100;
y = rand() % 100;
z = rand() % 4;
r1 = 0;
r2 = 0;
switch (z)
{
case 0:
cout << x << "+" << y << "=";
cin >> r1;
cin.get();
r2 = x + y;
if (r1 == r2)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
break;
case 1:
if (x<y)
{
t = x;
x = y;
y = t;
}
else;
cout << x << "-" << y << "=";
cin >> r1;
cin.get();
r2 = x - y;
if (r1 == r2)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
break;
case 2:
cout << x << "*" << y << "=";
cin >> r1;
r2 = x * y;
if (r1 == r2)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
break;
case 3:
if (y != 0)
{
cout << x << "÷" << y << "=";
c = maxNum(x, y);
m = x / c;
n = y / c;
if (n != 1)
{
sprintf_s(r3, "%d/%d", m, n);
cin >> r4;
if (strcmp(r3, r4) == 0)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
}
else
{
cin >> r2;
if (r2 == m) {
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
}
}
else {
cout << x << "÷" << "1" << "=";
cin >> r2;
if (r2 == x) {
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
}
break;
default:
cout << "wrong" << endl;
break;
}
return 0;
}
int fra() {
int x, y, z, t, m, n, c, r1, r2, i, j;
char r3[10], r4[10];
srand(time(NULL));
memset(r3, 0, sizeof(r3));
memset(r4, 0, sizeof(r4));
x = rand() % 100;
y = rand() % 100;
i = rand() % 100;
j = rand() % 100;
z = rand() % 4;
r1 = 0;
r2 = 0;
if (y == 0 || y == 1)
y = 2;
if (j == 0 || j == 1)
j = 2;
switch (z)
{
case 0:
cout << x << "/" << y << "+" << i << "/" << j << "=";
m = (x*j) + (i*y);
n = y*j;
c = maxNum(m, n);
m = m / c;
n = n / c;
if (n != 1) {
sprintf_s(r3, "%d/%d", m, n);
cin >> r4;
if (strcmp(r3, r4) == 0)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
}
else {
cin >> r2;
if (r2 == m)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
}
break;
case 1:
if ((x*j)<(i*y))
{
t = x;
x = i;
i = t;
t = y;
y = j;
j = t;
}
else;
cout << x << "/" << y << "-" << i << "/" << j << "=";
m = (x*j) - (i*y);
n = y*j;
c = maxNum(m, n);
m = m / c;
n = n / c;
if (n != 1) {
sprintf_s(r3, "%d/%d", m, n);
cin >> r4;
if (strcmp(r3, r4) == 0)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
}
else {
cin >> r2;
if (r2 == m)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
}
break;
case 2:
cout << x << "/" << y << "×" << i << "/" << j << "=";
m = x*i;
n = y*j;
c = maxNum(m, n);
m = m / c;
n = n / c;
if (n != 1) {
sprintf_s(r3, "%d/%d", m, n);
cin >> r4;
if (strcmp(r3, r4) == 0)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
}
else {
cin >> r2;
if (r2 == m)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
}
break;
case 3:
cout << x << "/" << y << "÷" << i << "/" << j << "=";
m = x*j;
n = y*i;
c = maxNum(m, n);
m = m / c;
n = n / c;
if (n != 1) {
sprintf_s(r3, "%d/%d", m, n);
cin >> r4;
if (strcmp(r3, r4) == 0)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
}
else {
cin >> r2;
if (r2 == m)
{
cout << " " << "T" << endl;
b = b + 1;
}
else cout << " " << "F" << endl;
}
break;
default:
cout << "wrong" << endl;
break;
}
return 0;
}
int main(int argc, char*argv[]) {
int a, c;
if (argc<2)
cin >> a;
else a = atoi(argv[2]);
srand(time(NULL));
for (int i = 0; i < a; i++) {
c = rand() % 2;
switch (c) {
case 0:INT(); break;
case 1:fra(); break;
default:
cout << "wrong" << endl;
break;
}
}
cout << "grade:" << b;
return 0;
}
运行截图:
