用 C++ 统计动物园中动物的数量(已知头和腿的数量)


给定动物园中动物的头和腿的总数,任务是计算动物园中动物的总数。在下面的程序中,我们假设动物是鹿和孔雀。

输入

heads = 60
legs = 200

输出

Count of deers are: 40
Count of peacocks are: 20

解释

let total number of deers to be : x
Let total number of peacocks to be : y
As head can be only one so first equation will be : x + y = 60
And deers have 4 legs and peacock have 2 legs so second equation will be : 4x + 2y = 200
Solving equations then it will be:
4(60 - y) + 2y = 200
240 - 4y + 2y = 200
y = 20 (Total count of peacocks)
x = 40(Total count of heads - total count of peacocks)

输入

heads = 80
Legs = 200

输出

Count of deers are: 20
Count of peacocks are: 60

解释

let total number of deers to be : x
Let total number of peacocks to be : y
As head can be only one so first equation will be : x + y = 80
And deers have 4 legs and peacock have 2 legs so second equation will be : 4x + 2y = 200
Solving equations then it will be:
4(80 - y) + 2y = 200
320 - 4y + 2y = 200
y = 60 (Total count of peacocks)
x = 20(Total count of heads - total count of peacocks)

下面程序中使用的算法如下:

  • 输入动物园中头和腿的总数。

  • 创建一个函数来计算鹿的数量。

  • 在函数内部,将鹿的数量设置为 ((腿)-2 * (头))/2

  • 返回鹿的数量。

  • 现在,通过从动物园中头的总数减去鹿的总数来计算孔雀的数量。

  • 打印结果。

示例

 在线演示

#include <bits/stdc++.h>
using namespace std;
// Function that calculates count for deers
int count(int heads, int legs){
   int count = 0;
   count = ((legs)-2 * (heads))/2;
   return count;
}
int main(){
   int heads = 80;
   int legs = 200;
   int deers = count(heads, legs);
   int peacocks = heads - deers;
   cout<<"Count of deers are: "<<deers<< endl;
   cout<<"Count of peacocks are: " <<peacocks<< endl;
   return 0;
}

输出

如果运行以上代码,我们将得到以下输出:

Count of deers are: 20
Count of peacocks are: 60

更新于:2020年6月6日

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