Table of Contents
In this example, you will learn to compute the power of a number.
To understand this example, you should have the knowledge of the following Python programming topics:
- Python pow()
- Python for Loop
- Python while Loop
1. Example 1: Calculate power of a number using a while loop
base = 3 exponent = 4 result = 1 while exponent != 0: result *= base exponent-=1 print("Answer = " + str(result))
Output
Answer = 81
In this program, base
and exponent
are assigned values 3 and 4 respectively.
Using the while loop, we keep on multiplying the result
by base
until the exponent
becomes zero.
In this case, we multiply result
by base 4 times in total, so result = 1 * 3 * 3 * 3 * 3 = 81
.
2. Example 2: Calculate power of a number using a for loop
base = 3 exponent = 4 result = 1 for exponent in range(exponent, 0, -1): result *= base print("Answer = " + str(result))
Output
Answer = 81
Here, instead of using a while loop, we’ve used a for loop.
After each iteration, the exponent is decremented by 1, and the result is multiplied by the base exponent number of times.
Both programs above do not work if you have a negative exponent. For that, you need to use the pow()
function in the Python library.
3. Example 3: Calculate the power of a number using pow() function
base = 3 exponent = -4 result = pow(base, exponent) print("Answer = " + str(result))
Output
Answer = 0.012345679012345678
pow()
accepts two arguments: base and exponent. In the above example, 3 raised to the power -4 is calculated using pow()
.