valarray acos() function in C++ Last Updated : 24 Oct, 2018 Comments Improve Suggest changes Like Article Like Report The acos() function is defined in valarray header file. This function is used to calculate arc cosine of the value of each element in valarray and returns a valarray containing the arc cosine of all the elements. Syntax: acos(varr); Parameter: This function takes a mandatory parameter varr which represents valarray. Returns: This function returns a valarray containing the arc cosine of all the elements. Below programs illustrate the above function: Example 1:- CPP // C++ program to demonstrate // example of acos() function. #include <bits/stdc++.h> using namespace std; int main() { // Initializing valarray valarray<double> varr = { 0, 0.25, 0.5, 0.75, 1 }; // Declaring new valarray valarray<double> varr1; // use of acos() function varr1 = acos(varr); // Displaying new elements value cout << "The new valarray with" << " manipulated values is : " << endl; for (double& x : varr1) { cout << x << " "; } cout << endl; return 0; } Output: The new valarray with manipulated values is : 1.5708 1.31812 1.0472 0.722734 0 Example 2:- CPP // C++ program to demonstrate // example of acos() function. #include <bits/stdc++.h> using namespace std; int main() { // Initializing valarray valarray<double> varr = { 0.2, 0.14, 5.0, 0.0 }; // Declaring new valarray valarray<double> varr1; // use of acos() function varr1 = acos(varr); // Displaying new elements value cout << "The new valarray with" << " manipulated values is : " << endl; for (double& x : varr1) { cout << x << " "; } cout << endl; return 0; } Output: The new valarray with manipulated values is : 1.36944 1.43033 nan 1.5708 Create Quiz Comment B bansal_rtk_ Follow 0 Improve B bansal_rtk_ Follow 0 Improve Article Tags : Misc C++ CPP-Functions cpp-valarray Explore C++ BasicsIntroduction to C++3 min readData Types in C++6 min readVariables in C++4 min readOperators in C++9 min readBasic Input / Output in C++3 min readControl flow statements in Programming15+ min readLoops in C++7 min readFunctions in C++8 min readArrays in C++8 min readCore ConceptsPointers and References in C++5 min readnew and delete Operators in C++ For Dynamic Memory5 min readTemplates in C++8 min readStructures, Unions and Enumerations in C++3 min readException Handling in C++12 min readFile Handling in C++8 min readMultithreading in C++8 min readNamespace in C++5 min readOOP in C++Object Oriented Programming in C++8 min readInheritance in C++6 min readPolymorphism in C++5 min readEncapsulation in C++3 min readAbstraction in C++4 min readStandard Template Library(STL)Standard Template Library (STL) in C++3 min readContainers in C++ STL2 min readIterators in C++ STL10 min readC++ STL Algorithm Library3 min readPractice & ProblemsC++ Interview Questions and Answers1 min readC++ Programming Examples4 min read Like