How to express nth power in c++

The methods for expressing nth power in C include: pow() function: calculate the power; multiplication operator: suitable for positive integer power; expm1() function: calculate the power result minus 1; log( pow()): Computes powers indirectly by calculating logarithms and applying exponential functions.

Representing n power in C

In the C programming language, there are many ways to represent n Power:

pow() Function:

• pow() function is a method used to calculate n power in the standard C function library.
• Syntax: double pow(double base, double exponent);

• Parameters:

  • base: to calculate the power Base
  • exponent: power exponent
• Return value: the result of base raised to the exponent power

Use the multiplication operator ( :):

• For positive integer powers, you can use the multiplication operator (**) to calculate the nth power.
• Syntax: double result = base * base * ... * base;
• Repeatedly multiply the base by itself n times.

expm1() function:

• expm1() function is used to calculate the power result minus 1.
• Syntax: double expm1(double exponent);
• Parameters: Exponent of logarithm
• Return value: The result of e raised to the exponent power minus 1

log(pow()):

• You can also calculate the nth power indirectly by calculating the logarithm and then applying the exponential function.
• Syntax: double result = exp(log(base) * exponent);

Example:

Here are some examples of how to calculate n powers in C:

<code class="cpp">// 使用 pow() 函数
double result1 = pow(2, 3); // 8

// 使用乘法运算符
double result2 = 2 * 2 * 2; // 8

// 使用 expm1() 函数
double result3 = expm1(3); // 7 (e^3 - 1)

// 使用 log(pow())
double result4 = exp(log(2) * 3); // 8</code>

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