Electronic Society C language level 1 32, calculate the power of 2

Method 1 ： 

/*
 Electronics Association  C Language  1 level   32、 Calculation 2 The power of   Method 1  

 Given a nonnegative integer  n, seek  2n.
 Input 
 An integer  n.0 <= n < 31.
 Output 
 An integer , namely  2  Of  n  Power .
 The sample input 
3
 Sample output 
8
*/
#include<iostream>
#include<cmath>
using namespace std;
int main() 
{
	int n;
	
	cin>>n;
	
	cout<<pow(2,n);
	
	return 0;
}

/*
12: Calculation 2 Of N Power 
http://noi.openjudge.cn/ch0106/12/

2809: Calculation 2 Of N Power 
http://bailian.openjudge.cn/practice/2809/

13: To calculate by power 
http://noi.openjudge.cn/ch0105/13/
*/

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Method 2 ：

/*
 Electronics Association  C Language  1 level   32、 Calculation 2 The power of   Method 2  

 Given a nonnegative integer  n, seek  2^n.
 Input 
 An integer  n.0 <= n < 31.
 Output 
 An integer , namely  2  Of  n  Power .
 The sample input 
3
 Sample output 
8
*/
#include<iostream>
#include<cmath>
using namespace std;
int main() 
{
	int n,ans=1;
	
	cin>>n;
	
	for(int i=1;i<=n;i++)
	{
		ans*=2;
	}
	
	cout<<ans<<endl;
	
	return 0;
}

/*
12: Calculation 2 Of N Power 
http://noi.openjudge.cn/ch0106/12/

2809: Calculation 2 Of N Power 
http://bailian.openjudge.cn/practice/2809/

13: To calculate by power 
http://noi.openjudge.cn/ch0105/13/
*/

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Links to related topics ：

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12: Calculation 2 Of N Power

OpenJudge - 12: Calculation 2 Of N Power

2809: Calculation 2 Of N Power

OpenJudge - 2809: Calculation 2 Of N Power

13: To calculate by power

OpenJudge - 13: To calculate by power

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