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

## C For Loop: Exercise-25 with Solution

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

The series is as below:

1 4 9 16 ... n Terms

**Sample Solution:**

**C Code:**

```
#include <stdio.h> // Include the standard input/output header file.
int main() {
int i, n, sum = 0; // Declare variables for loop control and sum calculation.
printf("Input the number of terms : "); // Prompt the user for input.
scanf("%d", &n); // Read the value of 'n' from the user.
printf("\nThe square natural numbers up to %d terms are :", n); // Print a message.
for(i = 1; i <= n; i++) // Loop to calculate square of natural numbers.
{
printf("%d ", i*i); // Print the square of the current natural number.
sum += i*i; // Add the square to the running sum.
}
printf("\nThe Sum of Square Natural Numbers up to %d terms = %d \n", n, sum); // Print the sum.
return 0; // Return 0 to indicate successful execution.
}
```

Sample Output:

Input the number of terms : 5 The square natural upto 5 terms are :1 4 9 16 25 The Sum of Square Natural Number upto 5 terms = 55

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**Previous:** Write a program in C to find the sum of the series [ x - x^3 + x^5 + ......].

**Next:** Write a program in C to find the sum of the series 1 +11 + 111 + 1111 + .. n terms.

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