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valarray log10() function in C++

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  • Last Updated : 24 Oct, 2018
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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:-




// C++ program to demonstrate
// example of log10() function.
  
#include <bits/stdc++.h>
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

Example 2:-




// C++ program to demonstrate
// example of log10() function.
  
#include <bits/stdc++.h>
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

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