# C#: Calculate n terms of square natural number and their sum

## C# Sharp For Loop: Exercise-25 with Solution

Write a C# Sharp program that displays the n terms of square natural numbers and their sum.

The series is as below:

**Sample Solution**:-

**C# Sharp Code:**

```
using System;
public class Exercise25
{
public static void Main()
{
int i,n,sum=0;
Console.Write("\n\n");
Console.Write("Calculate n terms of square natural number and their sum:\n");
Console.Write("-----------------------------------------------------------");
Console.Write("\n\n");
Console.Write("Input the number of terms : ");
n= Convert.ToInt32(Console.ReadLine());
Console.Write("\nThe square natural upto {0} terms are :",n);
for(i=1;i<=n;i++)
{
Console.Write("{0} ",i*i);
sum+=i*i;
}
Console.Write("\nThe Sum of Square Natural Number upto {0} terms = {1} \n",n,sum);
}
}
```

Sample Output:

Calculate n terms of square natural number and their sum: ----------------------------------------------------------- Input the number of terms : 10 The square natural upto 10 terms are :1 4 9 16 25 36 49 64 81 100 The Sum of Square Natural Number upto 10 terms = 385

**Flowchart:**

**C# Sharp Code Editor:**

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