Program:

The source code to convert negative values of an array into positive is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.

// C# program to convert negative values 
//an integer array into positive.

using System;

class Demo
{
    public static void Main()
    {
        int[] arr = { 10, -20, 30, -40, 50, -60, 70 };
        int loop = 0;
        
        for (loop = 0; loop < arr.Length; loop++)
        {
            if (arr[loop] < 0)
                arr[loop] = -arr[loop];
        }

        Console.WriteLine("Array elements after conversion:");
        for (loop = 0; loop < arr.Length; loop++)
        {
            Console.Write(arr[loop]+" ");
        }
        Console.WriteLine();
    }
}

Output:

Array elements after conversion:
10 20 30 40 50 60 70
Press any key to continue . . .

Explanation:

In the above program, we created a class Demo that contains the Main() method. Here we created an array of integers that contains negative and positive integer elements.

for (loop = 0; loop < arr.Length; loop++)
{
    if (arr[loop] < 0)
        arr[loop] = -arr[loop];
}

In the above code, we converted negative integer values into positive values, and then we printed the elements of the array on the console screen.