Here is a Python program that accomplishes the task:

```python
# Function to calculate sum of diagonal elements
def diagonal_sum(matrix, n):
sum = 0
for i in range(0, n):
sum += matrix[i][i]
return sum

# Input number of rows and columns
n, m = map(int, input().split())

# Check if the matrix is square
if n != m:
print("Matrix is not square")
else:
# Input matrix elements
matrix = []
for i in range(n):
row = list(map(int, input().split()))
matrix.append(row)

# Print sum of diagonal elements
print(diagonal_sum(matrix, n))
```

This program first checks if the matrix is square (i.e., the number of rows equals the number of columns). If it is, it reads the matrix elements from the user, calculates the sum of the diagonal elements using the `diagonal_sum` function, and prints the result.

Question

Here is a Python program that accomplishes the task:

```python
# Function to calculate sum of diagonal elements
def diagonal_sum(matrix, n):
    sum = 0
    for i in range(0, n):
        sum += matrix[i][i]
    return sum

# Input number of rows and columns
n, m = map(int, input().split())

# Check if the matrix is square
if n != m:
    print("Matrix is not square")
else:
    # Input matrix elements
    matrix = []
    for i in range(n):
        row = list(map(int, input().split()))
        matrix.append(row)

# Print sum of diagonal elements
    print(diagonal_sum(matrix, n))
```

This program first checks if the matrix is square (i.e., the number of rows equals the number of columns). If it is, it reads the matrix elements from the user, calculates the sum of the diagonal elements using the `diagonal_sum` function, and prints the result.

Knowee AI · Accepted Answer

Here is a Python program that accomplishes the task:

```python
# Function to calculate sum of diagonal elements
def diagonal_sum(matrix, n):
    sum = 0
    for i in range(0, n):
        sum += matrix[i][i]
    return sum

# Input number of rows and columns
n, m = map(int, input().split())

# Check if the matrix is square
if n != m:
    print("Matrix is not square")
else:
    # Input matrix elements
    matrix = []
    for i in range(n):
        row = list(map(int, input().split()))
        matrix.append(row)

# Print sum of diagonal elements
    print(diagonal_sum(matrix, n))
```

This program first checks if the matrix is square (i.e., the number of rows equals the number of columns). If it is, it reads the matrix elements from the user, calculates the sum of the diagonal elements using the `diagonal_sum` function, and prints the result.

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