The C language pow() function is used to find the value of x to the power of y.
Header file: math.h
Grammar/prototype:
double pow(double x,double y);
Parameter Description:
x: Double precision number. y: double-precision number.
Return value: the value of x raised to the power of y.
[Example 1] Use the pow() function to find the 6th power of 4, the code is as follows:
#include <stdio.h>
#include <math.h>
int main () {
double x = 4, y = 6; //Assign initial value to the variable
double result = pow(x, y); //Find a to the b power
printf("%lf\n", result);
return 0;
}
operation result:
4096.000000
[Example 2] Use the C language pow() function to calculate the power of the value entered by the user.
#include <stdio.h>
#include <math.h>
int main () {
double a, b; //Define two variables
printf("Please enter a number:"); //output prompt information
scanf("%lf", &a); //Get the value entered by the user
printf("Please enter the power:"); //output prompt information
scanf("%lf", &b); //Get the value entered by the user
printf("result: %lf\n", pow(a, b)); //output result
return 0;
}
operation result:
Please enter a number: 10
Please enter the power: 4
result: 10000.000000
Circumstances that may cause the error:
If the base x is negative and the exponent y is not an integer, it will cause a domain error. If the base x and exponent y are both 0, it may or may not cause a domain error; this is related to the implementation of the library.
If the base x is 0 and the exponent y is negative, it may or may not cause a domain error or pole error; this is related to the implementation of the library. If the return value ret is too large or too small, it will cause a range error.
error code:
If a domain error error occurs, the global variable errno will be set to EDOM; if a pole error or range error error occurs, the global variable errno will be set to ERANGE.
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