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C++ Math acos() Function

C++ Math acos() Function with tutorial for beginners and professionals with examples on isgreaterequal(), less(), islessequal(), islessgreater(), isunordered(), exp(), frexp(), ldexp(), log(), log10(), modf(), exp2(), expm1(), log1p(), log2(), logb(), scalbn(), scalbln() etc.

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C++ Math acos()

This function computes the inverse cosine of a number in radian.

acos(x) = cos -1x

Syntax

Suppose a number is x. Syntax would be:

float acos(float x);
double acos(double x);
long double acos(long double x);
double acos(integral x);

Note: If the value passed is an integer type, then it is cast to double.

Parameter

x: The value whose arc cosine is to be calculated. It should be in the range[-1,1].

Return value

Parameter Return value
-1≤x≤1 (0,∏)
x<-1 or x>1 Not a number

Example 1

Let's see the simple example when the value of x is greater than 1.

#include 
#include
using namespace std;
int main()
{
    float degree=90;
    float x=degree*3.14/180;
    std::cout << "Value of cosine is :" <

Output:

Value of cosine is :0.000796274
Inverse of cosine is :nan

In this example, acos() function calculates the inverse cosine of a number when the value of x is greater than 1.

Example 2

Let's see the simple example when the value of x is equal to zero.

#include 
#include
using namespace std;
int main()
{
    float degree=0;
    float x=degree*3.14/180;
    std::cout << "Value of cosine is :" <

Output:

Value of cosine is :1
Inverse of cosine is :1.5708

In this example, acos() function calculates the inverse cosine of a number when the value of x is equal to zero.

Example 3

Let's see the simple example when the value x is less than -1.

#include 
#include
using namespace std;
int main()
{
    float degree= -60;
    float x=degree*3.14/180;
    std::cout << "Value of cosine is :" <

Output:

Value of cosine is :0.50046
Inverse of cosine is :nan

In this example, acos() function calculates the inverse cosine of a number when the value of x is less than -1.


Next TopicC++ Math Functions




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