shway
/
DSA
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

enh(CPlusPlus): add missing space to power-of-two maths (#667) 

Co-authored-by: Rahul Rajeev Pillai <66192267+Ashborn-SM@users.noreply.github.com>
Co-authored-by: datshan-trivedi-10 <dbtrivedi03@gmail.com>
pull/540/head^2
Darshan Trivedi 2022-01-13 18:29:14 +05:30 committed by GitHub
parent 110518e7c6
commit f97cb54a2e
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 24 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
algorithms/CPlusPlus/Maths/power-of-two.cpp
View File

@ -1,27 +1,37 @@
#include <iostream>
using namespace std;
//function starts
bool isPowerOfTwo(const n)
// function starts
bool isPowerOfTwo(const int n)
{
//declare a variable to know if n is a power of 2 or not
// declare a variable to know if n is a power of 2 or not
long i = 1;
//at every iteration it will calcalute power of 2 starting from 1
// at every iteration it will calcalute power of 2 starting from 1
while (i < n)
{
i = i * 2;
}
//if n is the power of 2, i and n value will be same
//if they are same, it will return true, else it will return false
// if n is the power of 2, i and n value will be same
// if they are same, it will return true, else it will return false
return i == n;
}
//main starts
// Binary Method to check number is in power of two or not.
// Time Complexity of this method is O(1)
bool ispoweroftwo(const int n)
{
// if number is in power of two it will give 0, otherwise it will not zero.
return n != 0 && (n & (n - 1)) == 0;
}
// main starts
int main()
{
int n;
cin >> n;
cout << isPowerOfTwo(n);
cout << isPowerOfTwo(n) << endl;
// Check using Binary Method
cout << ispoweroftwo(n) << endl;
return 0;
}
@ -30,12 +40,14 @@ Example 1:
Input: n = 1
Output:1 (true)
Explanation: 20 = 1
Explanation: 2^0 = 1
Example 2:
Input: n = 16
Output:1 (true)
Explanation: 24 = 16
Explanation: 2^4 = 16
Example 3:
Input: n = 3