How to calculate power in C language
Apr 13, 2024 pm 09:15 PMThere are the following three methods for calculating power in C language: pow() function: suitable for floating point numbers, but not as efficient as other methods. Fast power arithmetic: most efficient, suitable for integers and floating point numbers. Loops: Less efficient, but easier to understand.
Calculate the power in C language
In C language, you can use the following method to calculate the power:
Method 1: Use the pow() function
#include <math.h> double result = pow(base, exponent);
Method 2: Use the fast power algorithm
double fastpow(double base, int exponent) { if (exponent == 0) { return 1; } else if (exponent < 0) { return 1 / fastpow(base, -exponent); } else { double halfPower = fastpow(base, exponent / 2); if (exponent % 2 == 0) { return halfPower * halfPower; } else { return halfPower * halfPower * base; } } }
Method 3: Using Loop
double iterativePow(double base, int exponent) { double result = 1; if (exponent < 0) { base = 1 / base; exponent = -exponent; } for (int i = 0; i < exponent; i++) { result *= base; } return result; }
Which method to choose?
- pow() function: The simplest method, but only works with floating point numbers.
- Fast power arithmetic: The most efficient method, suitable for integers and floating point numbers.
- Loop: Less efficient method, but easy to understand.
Example:
Calculate 2 raised to the 10th power:
double result1 = pow(2, 10); double result2 = fastpow(2, 10); double result3 = iterativePow(2, 10);
Note:
- Make sure exponent is an integer.
- If base is negative and exponent is odd, the result will be negative.
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