How do you find out if a number is a power of 4 in C++?
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How do you find out if a number is a power of 4 in C++?
- int main()
- { unsigned n = 256;
- if (checkPowerOf4(n)) { cout << n << ” is a power of 4″;
- } else {
- cout << n << ” is not a power of 4″; }
- return 0; }
How do you find out if a number is a power of 4?
A simple method is to take a log of the given number on base 4, and if we get an integer then the number is the power of 4. 2. Another solution is to keep dividing the number by 4, i.e, do n = n/4 iteratively.
How do you check if a number is a power of 2 in C++?
Another solution is to keep dividing the number by two, i.e, do n = n/2 iteratively. In any iteration, if n\%2 becomes non-zero and n is not 1 then n is not a power of 2. If n becomes 1 then it is a power of 2.
How do you find out if a number is a power of 3?
if (log n) / (log 3) is integral then n is a power of 3….
- for 64-bit integers you shouldn’t get more than 64 cases.
- You could expand out the constants: e.g. n = 3 * 3 or n = 3 ** 2.
How do you find if a number is power of a number?
Following are detailed step. 1) Initialize pow = x, i = 1 2) while (pow < y) { pow = pow*pow i *= 2 } 3) If pow == y return true; 4) Else construct an array of powers from x^i to x^(i/2) 5) Binary Search for y in array constructed in step 4. If not found, return false. Else return true.
How do you find the power of a number?
A number, X, to the power of 2 is also referred to as X squared. The number X to the power of 3 is called X cubed. X is called the base number. Calculating an exponent is as simple as multiplying the base number by itself.
How do you check if a number is a power of 2?
Keep dividing the number by two, i.e, do n = n/2 iteratively until n becomes 1. In any iteration, if n\%2 becomes non-zero and n is not 1 then n is not a power of 2. If n becomes 1 then it is a power of 2.
How do you do log2 in C++?
The log2() function in C++ returns the base-2 logarithm of the argument. The function is defined in header file….log2() Return value.
| Parameter (x) | Return Value |
|---|---|
| x = 1 | Zero |
| 0 > x > 1 | Negative |
| x = 0 | -∞ (- infinity) |
| x < 0 | NaN (Not a Number) |
What is Gandhi number?
If the sum of fourth power of individual digits of a number is equal to the number itself, then it is called gandhi number.
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