How to express the nth power of a number in C language

In C language, there are three ways to express the nth power of a number: pow() function: used to calculate numbers with specified powers, with higher accuracy but slower speed. Power operator ^: only works with integer powers, faster but less precise. Loop: works with any power value, but is slower.

Representing the nth power of a number in C language

In C language, a number can be expressed in the following way Number raised to the nth power:

pow() function

pow() The function is used to calculate the specified power of a given number. The syntax is as follows:

double pow(double base, double exponent);

Among them,

• base is the base (the number to be used to calculate the power)
• exponent is the exponent (the value of the power)

For example: to calculate the third power of 2, you can write like this:

double result = pow(2, 3); // result 将等于 8

Power operator (^)

In C language, the exponentiation operator ^ can be used to calculate the integer power of a number. The syntax is as follows:

int base ^ exponent;

Among them,

• base is the base (the number to be used to calculate the power)
• exponent is the exponent (the value of the power)

Note: The power operator can only be used to calculate integer powers.

For example: to calculate the 3rd power of 2, you can write like this:

int result = 2 ^ 3; // result 将等于 8

Use a loop

For non-integer powers or situations where precise calculations are required , you can use a loop to represent the nth power of a number.

For example: to calculate 2 raised to the 2.5th power, you can write like this:

double base = 2;
double exponent = 2.5;
double result = 1;
for (int i = 0; i < exponent; i++) {
    result *= base;
}

Compare

• pow() The function is faster and more accurate.
• The exponentiation operator can only calculate integer powers, but it is faster.
• The loop method works with any power value, but is slower.

The above is the detailed content of How to express the nth power of a number in C language. For more information, please follow other related articles on the PHP Chinese website!