# valarray log10() function in C++

The log10() function is defined in valarray header file. This function is used to calculate common logarithm of the value of the elements in valarray. Syntax:

`log10(varr);`

Parameter: This function takes a mandatory parameter varr which represents valarray. Returns: This function returns a valarray containing the common logarithm of all the elements. Below programs illustrate the above function: Example 1:-

## CPP

 `// C++ program to demonstrate``// example of log10() function.` `#include ``using` `namespace` `std;` `int` `main()``{` `    ``// Initializing valarray``    ``valarray<``double``> varr = { 1, 2, 3, 4, 5 };` `    ``// Declaring new valarray``    ``valarray<``double``> varr1;` `    ``// use of log10() function``    ``varr1 = ``log10``(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 :
0 0.30103 0.477121 0.60206 0.69897```

Time complexity: O(n)

Space Complexity: O(n)

Example 2:-

## CPP

 `// C++ program to demonstrate``// example of log10() function.` `#include ``using` `namespace` `std;``int` `main()``{` `    ``// Initializing valarray``    ``valarray<``double``>``        ``varr = { -1, 6, 3, 45, 5 };` `    ``// Declaring new valarray``    ``valarray<``double``> varr1;` `    ``// use of log10() function``    ``varr1 = ``log10``(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 :
nan 0.778151 0.477121 1.65321 0.69897```

Time complexity: O(n)

Space Complexity: O(n)

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