How to express C language index

How to express index in C language

There are two ways to express index in C language:

1. Directly expressed by floating point numbers:

10 to the Nth power is 1e10, or it can also be written as 1e 10 (if it is negative Nth power If so, change the plus sign to a minus sign).

Note: e can be either uppercase or lowercase. It should be noted that there must be a number in front of e, otherwise it will be an illegal expression.

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2. Use a power function to express:

in c language , finding the yth power of x can be expressed as pow(x,y), so 10 to the Nth power can also be expressed as pow(10,N).

Note: The pow function is in the header file math.h, so when calling this function, math.h must be added, that is,

#include <math.h>

Prototype: extern float pow(float x , float y);

Function: Calculate the y power of x.

Description: x should be greater than zero, and the result of the power exponent is returned.

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