Here is a Python program that fulfills the requirements:

```python
# Function to calculate sum of even elements in a matrix
def sum_of_even_elements(matrix, n):
sum = 0
for i in range(n):
for j in range(n):
if matrix[i][j] % 2 == 0:
sum += matrix[i][j]
return sum

# Input size of matrix
n = int(input())

# Initialize matrix
matrix = []

# Input elements of matrix
for i in range(n):
row = list(map(int, input().split()))
matrix.append(row)

# Calculate and print sum of even elements
sum = sum_of_even_elements(matrix, n)
print(sum)
```

This program first takes an integer input `n` for the size of the square matrix. It then takes `n` lines of input, each containing `n` space-separated integers, to form the matrix. The function `sum_of_even_elements` is used to calculate the sum of all even elements in the matrix. This sum is then printed. If there are no even elements in the matrix, the sum will be 0, so "0" will be printed.

Question

Here is a Python program that fulfills the requirements:

```python
# Function to calculate sum of even elements in a matrix
def sum_of_even_elements(matrix, n):
    sum = 0
    for i in range(n):
        for j in range(n):
            if matrix[i][j] % 2 == 0:
                sum += matrix[i][j]
    return sum

# Input size of matrix
n = int(input())

# Initialize matrix
matrix = []

# Input elements of matrix
for i in range(n):
    row = list(map(int, input().split()))
    matrix.append(row)

# Calculate and print sum of even elements
sum = sum_of_even_elements(matrix, n)
print(sum)
```

This program first takes an integer input `n` for the size of the square matrix. It then takes `n` lines of input, each containing `n` space-separated integers, to form the matrix. The function `sum_of_even_elements` is used to calculate the sum of all even elements in the matrix. This sum is then printed. If there are no even elements in the matrix, the sum will be 0, so "0" will be printed.

Knowee AI · Accepted Answer

Here is a Python program that fulfills the requirements:

```python
# Function to calculate sum of even elements in a matrix
def sum_of_even_elements(matrix, n):
    sum = 0
    for i in range(n):
        for j in range(n):
            if matrix[i][j] % 2 == 0:
                sum += matrix[i][j]
    return sum

# Input size of matrix
n = int(input())

# Initialize matrix
matrix = []

# Input elements of matrix
for i in range(n):
    row = list(map(int, input().split()))
    matrix.append(row)

# Calculate and print sum of even elements
sum = sum_of_even_elements(matrix, n)
print(sum)
```

This program first takes an integer input `n` for the size of the square matrix. It then takes `n` lines of input, each containing `n` space-separated integers, to form the matrix. The function `sum_of_even_elements` is used to calculate the sum of all even elements in the matrix. This sum is then printed. If there are no even elements in the matrix, the sum will be 0, so "0" will be printed.

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