四则运算3
要求：
一、题目避免重复
二、定制（数量/打印方式）
三、控制参数
1.是否有乘除法
2.是否有负数
3.是否有余数
4.答题控制小数点后2位
5.是否有括号
四、控制数字范围
(新要求)五、成功的表示了正确答案和题目答对次数
设计思想：
1、首先题目避免重复可以根据位数和里面的随机数相比较来控制
2、是否有乘除、是否有负数、是否有分数、是否有小数、是否有括号可以根据一个函数来定义所有情况
3.控制数字范围可以用算式%rand（max-min+1）+min来实现
#include<iostream> #include<stdio.h> #include<time.h> #include<fstream> using namespace std; int main() { ofstream outfile; int i, a, b, c, d, e, f, g, l, m, o, x, y, z, count=0; double finalnum = 0, cnum; int number, muldiv, rnum, numf, neg, rem; //muldiv判断乘除,rnum判断随机数,numf数值范围,neg判断有无负数,rem判断有无余数 char psign, msign; //符号正负 int bra, braran; //bra判断是否有括号 int num, signnum; //num数字个数,signnum符号个数 int numarray[20]; //szsz数字数组 char fh[4] = { '+', '-', '*', '/' }, signarray[10];//fhsz符号数组 cout << "请输入要打印的数量:"; cin >> number; cout << "请输入数值范围：0-"; cin >> numf; cout << "是否有括号： 1、有 2、无 ："; cin >> bra; cout << "加减有无负数： 1、有 2、无 :"; cin >> neg; cout << "是否有乘除法： 1、有 2、无 :"; cin >> muldiv; if (muldiv == 1) { cout << "除法有无余数: 1、有 2、无 :"; cin >> rem; } srand((unsigned)time(NULL));//时间种子，每次出现随机数不同 if (bra == 1) //判断是否有括号 { braran = 3; } if (bra == 2) { braran = 2; } if (muldiv == 1) //判断是否有乘除 { rnum = 4; } if (muldiv == 2) { rnum = 2; } for (i = 0; i < number; i++) { a = rand() % numf; b = rand() % numf; e = rand() % numf; f = rand() % numf; if (neg == 1) { l = rand() % 2; m = rand() % 2; if (l == 0) //加减有负数时，随机生成正负号 { psign = '-'; } if (l == 1) { psign = ' '; } if (m == 0) { msign = '-'; } if (m == 1) { msign = ' '; } } else { psign = msign = ' '; } switch (d = rand() % braran) { case 0: //整数 { switch (c = rand() % rnum) { case 0:cout << psign << a << "+" << msign << b << "=" << endl; cnum = a + b; cin >> finalnum; if (psign == ' '&&msign == ' ') { cnum = a + b; } if (psign == '-'&&msign == ' ') { cnum = b - a; } if (psign == ' '&&msign == '-') { cnum = a - b; } if (psign == '-'&&msign == '-') { cnum = -a - b; } if (int(finalnum * 100) == int(cnum * 100)) { cout << "答案正确！" << endl; count++; } else { cout << "答案错误！" << endl; cout << "正确答案为：" << cnum << endl; } break; case 1:cout << psign << a << "-" << msign << b << "=" << endl; cnum = a - b; cin >> finalnum; if (psign == ' '&&msign == ' ') { cnum = a - b ; } if (psign == '-'&&msign == ' ') { cnum = -b - a ; } if (psign == ' '&&msign == '-') { cnum = a + b ; } if (psign == '-'&&msign == '-') { cnum = -a + b ; } if (int(finalnum*100) ==int (cnum*100)) { cout << "答案正确！" << endl; count++; } else { cout << "答案错误！" << endl; cout << "正确答案为：" << cnum << endl; } break; case 2:cout << a << "×" << b << "=" << endl; cnum = a * b; cin >> finalnum; if (int(finalnum * 100) == int(cnum * 100)) { cout << "答案正确！" << endl; count++; } else { cout << "答案错误！" << endl; cout <<"正确答案为："<< cnum << endl; } break; case 3: { if (rem == 2) { while (b == 0) { b = rand() % numf; } o = a%b; while (o != 0) { b = rand() % numf; while (b == 0) { a = rand() % numf; b = rand() % numf; } o = a%b; } } else { while (b == 0) { b = rand() % numf; } } cout << a << "÷" << b << "=" << endl; cnum = a / b; cin >> finalnum; if (int(finalnum * 100) == int(cnum * 100)) { cout << "答案正确！" << endl; count++; } else { cout << "答案错误！" << endl; cout << "正确答案为：" << cnum << endl; } }break; } } break; case 1://真分数 { while (a == 0 || b == 0 || a >= b) { a = rand() % numf; b = rand() % numf; } while (e == 0 || f == 0 || e >= f) { e = rand() % numf; f = rand() % numf; } switch (g = rand() % rnum) { case 0: { cout << psign << a << "/" << b << "+" << msign << e << "/" << f << "=" << endl; cin >> finalnum; if (psign == ' '&&msign == ' ') { cnum = a / double (b) + e / double(f); } if (psign == '-'&&msign == ' ') { cnum = e / double(f) - a / double (b); } if (psign == ' '&&msign == '-') { cnum = a / double (b) - e / double(f); } if (psign == '-'&&msign == '-') { cnum = -a / double(b) - e / double(f); } if (int(finalnum * 100) == int(cnum * 100)) { cout << "答案正确！" << endl; count++; } else { cout << "答案错误！" << endl; cout << "正确答案为：" << cnum << endl; } break; } case 1: { cout << psign << a << "/" << b << "-" << msign << e << "/" << f << "=" << endl; cin >> finalnum; if (psign == ' '&&msign == ' ') { cnum = a / double(b) - e / double(f); } if (psign == '-'&&msign == ' ') { cnum = -(e / double(f)) - (a / double(b)); } if (psign == ' '&&msign == '-') { cnum = (a / double(b)) + (e / double(f)); } if (psign == '-'&&msign == '-') { cnum = -(a / double(b)) + (e / double(f)); } if (int(finalnum * 100) == int(cnum * 100)) { cout << "答案正确！" << endl; count++; } else { cout << "答案错误！" << endl; cout << "正确答案为：" << cnum << endl; } break; }cout << "一共答对了：" << count << "题" << endl; case 2: { cout << a << "/" << b << "×" << e << "/" << f << "=" << endl; cnum = (a / double(b)) * (e / double(f)); cin >> finalnum; if (int(finalnum * 100) == int(cnum * 100)) { cout << "答案正确！" << endl; count++; } else { cout << "答案错误！" << endl; cout << "正确答案为：" << cnum << endl; } break; } case 3: { cout << a << "/" << b << "÷" << e << "/" << f << "=" << endl; cnum = (a / double(b)) / (e / double(f)); cin >> finalnum; if (int(finalnum * 100) == int(cnum * 100)) { cout << "答案正确！" << endl; count++; } else { cout << "答案错误！" << endl; cout << "正确答案为：" << cnum << endl; } } } break; } break; case 2: { num = 3 + rand() % 8; //有括号时，数字和符号数组 signnum = num - 1; for (y = 0; y < num; y++) { numarray[y] = rand() % numf; } for (y = 0; y < signnum; y++) { x = rand() % 4; signarray[y] = fh[x]; } signarray[signnum] = '='; switch (z = signnum % 2) { case 0: { cout << numarray[0]; cout << signarray[0]; finalnum =finalnum+numarray[0]; for (y = 1; y < signnum; y++) { cout << "("; cout << numarray[y]; cout << signarray[y]; cout << numarray[y + 1]; cout << ")"; switch (y) { case'+':finalnum = finalnum + numarray[y] + numarray[y + 1]; break; case'-':finalnum = finalnum + numarray[y] - numarray[y + 1]; break; case'*':finalnum = finalnum + numarray[y] * numarray[y + 1]; break; case'/':finalnum = finalnum + numarray[y] / numarray[y + 1]; break; } cout << signarray[y + 1]; y = y + 1; }cout << endl; }break; case 1: { for (y = 0; y < signnum; y++) { cout << "("; cout << numarray[y]; cout << signarray[y]; cout << numarray[y + 1]; cout << ")"; switch (y) { case'+':finalnum = finalnum + numarray[y] + numarray[y + 1]; break; case'-':finalnum = finalnum + numarray[y] - numarray[y + 1]; break; case'*':finalnum = finalnum + numarray[y] * numarray[y + 1]; break; case'/':finalnum = finalnum + numarray[y] / numarray[y + 1]; break; } cout << signarray[y + 1]; y = y + 1; } cout << endl; cin >> finalnum; if (int(finalnum * 100) == int(cnum * 100)) { cout << "答案正确！" << endl; count++; } else cout << "答案错误！" << endl; cout << "正确答案为：" << cnum << endl; }break; } } break; } } cout << "一共答对了：" << count << "题" << endl; }
心得体会：
1.我们结对开发所以选择了较好的那个程序。
2.因为俩人分工合作，每个人负责不同的功能
3.我们先用一个数代表运算式的结果，然后再在这个数上根据运算符号添加运算
合作伙伴：朱建颖 http://www.cnblogs.com/zjy666/
