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

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);}elsereturn 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:

码云链接 https://git.oschina.net/lenmo/sizeyunsuan.git