这里给出的是一个立方体,它的一侧增加了给定的百分比。任务是找出立方体体积增加的百分比。
例子:
Input: x = 10
Output: 33.1%
Input: x = 50
Output: 237.5%
方法
- 在立方体中,所有边都相等,所以,
长=宽=高 - 让立方体的边 = a
- 给定百分比增加 = x%
- 所以,增加前的音量= a^3
- 增加后,新边 = a + ax/100
- 所以,新体积 = (a + ax/100)^3 = a^3 + (ax/100)^3 + 3a^3x/100 + 3a^3x^2/10000
- 成交量增加 = 新成交量 – 旧成交量 = (a^3 + (ax/100)^3 + 3a^3x/100 + 3a^3x^2/10000) – a^3 = (ax/100)^3 + 3a^3x/100 + 3a^3x^2/10000
- 因此,体积增加百分比 = (((ax/100)^3 + 3a^3x/100 + 3a^3x^2/10000)/a^3) * 100 = ((x/100)^3 + 3x/ 100 + 3x^2/10000) * 100 = x^3/10000 + 3x + 3x^2/100
下面是上述方法的实现:
C++
// C++ program to find percentage increase
// in the volume of the cube
// if a side of cube is increased
// by a given percentage
#include
using namespace std;
void newvol(double x)
{
cout << "percentage increase "
<< "in the volume of the cube is "
<< pow(x, 3) / 10000 + 3 * x
+ (3 * pow(x, 2)) / 100
<< "%" << endl;
}
// Driver code
int main()
{
double x = 10;
newvol(x);
return 0;
}
Java
// Java program to find percentage increase
// in the volume of the cube
// if a side of cube is increased
// by a given percentage
import java.io.*;
class GFG
{
static void newvol(double x)
{
System.out.print( "percentage increase "
+"in the volume of the cube is "
+ (Math.pow(x, 3) / 10000 + 3 * x
+ (3 * Math.pow(x, 2)) / 100) );
System.out.print("%");
}
// Driver code
public static void main (String[] args)
{
double x = 10;
newvol(x);
}
}
// This code is contributed by anuj_67..
Python3
# Python program to find percentage increase
# in the volume of the cube
# if a side of cube is increased
# by a given percentage
def newvol(x):
print("percentage increase"
"in the volume of the cube is ",
((x**(3)) / 10000 + 3 * x
+ (3 * (x**(2))) / 100),"%");
x = 10;
newvol(x);
# This code is contributed by PrinciRaj1992
C#
// C# program to find percentage increase
// in the volume of the cube
// if a side of cube is increased
// by a given percentage
using System;
class GFG
{
static void newvol(double x)
{
Console.Write( "percentage increase "
+"in the volume of the cube is "
+ (Math.Pow(x, 3) / 10000 + 3 * x
+ (3 * Math.Pow(x, 2)) / 100) );
Console.Write("%");
}
// Driver code
public static void Main ()
{
double x = 10;
newvol(x);
}
}
// This code is contributed by anuj_67..
Javascript
输出:
percentage increase in the volume of the cube is 33.1%
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