c++ 小案例:判断质数猜数字用符号填补心形图案

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文章目录

判断质数
猜数字
用符号填补心形图案

判断质数

#include<iostream>using namespace std;bool isprime(int num)
{int i = 2;while(i < num){if (num % i == 0){return false;}++i;}return true;
}int main()
{cout << "请输入一个不超过20亿的自然数" << endl;int num;cin >> num;if(isprime(num)){cout << "是质数" << endl;}else{cout << "不是质数" << endl;}cin.get();cin.get();
}

猜数字

#include<iostream>
#include<ctime>using namespace std;int rand_int()
{srand(time(0));int random_num = rand() % 100;return random_num;
}bool game_progress(int random_num)
{int guess_num;int i = 5;int low = 0, high = 100;while(i > 0){cout << "请输入一个" << low <<"~" << high <<"的数字。" << "你还有" << i << "次机会"<< endl;cin >> guess_num;if(guess_num == random_num){return true;}else if(guess_num > random_num){high = guess_num;}else{low = guess_num;}--i;}return false;
}void print_result(bool result, int random_num)
{if(result){cout << "恭喜你答对了" << endl;}else{cout << "游戏失败！你的机会已经用完,正确结果是：" << random_num << endl;}
}int main()
{int random_num;random_num = rand_int();cout << "现在已产生一个0~100的数字，请你猜猜看,注意你只有5次机会噢。" << endl;bool result;result = game_progress(random_num);print_result(result, random_num);
}

用符号填补心形图案

#include<iostream>
#include<cmath>using namespace std;void draw_heart()
{// (x^2 + y^2 - a)^3 - x^2 * y^3 = 0double a = 1;double bound = 1.3 * sqrt(a);double y_step = 0.05;double x_step = 0.025;for(double y = bound; y >= -bound; y -= y_step){for(double x = bound; x >= -bound; x -= x_step){double result = pow((pow(x, 2) + pow(y, 2) - a), 3) - pow(x, 2) * pow(y, 3);if(result > 0){cout << " ";} else{cout << "*";}}cout << endl;}cin.get();  cin.get();
}int main()
{draw_heart();
}