This problem can be solved by using Python's input and print functions, along with a simple if statement to check for negative values. Here's a step-by-step guide on how to do it:

1. First, we need to get the prices of the items from the user. We can do this using the input function in Python, which allows us to get user input. We'll also convert this input to a float, so we can work with decimal numbers.

```python
a4sheet_price = float(input("Cost of A4sheet:"))
pen_price = float(input("Cost of pen:"))
pencil_price = float(input("Cost of pencil:"))
eraser_price = float(input("Cost of eraser:"))
```

2. Next, we need to check if any of the prices are negative. If they are, we'll print an error message and stop the program. We can do this using an if statement.

```python
if a4sheet_price

Question

This problem can be solved by using Python's input and print functions, along with a simple if statement to check for negative values. Here's a step-by-step guide on how to do it:

1. First, we need to get the prices of the items from the user. We can do this using the input function in Python, which allows us to get user input. We'll also convert this input to a float, so we can work with decimal numbers.

```python
a4sheet_price = float(input("Cost of A4sheet:"))
pen_price = float(input("Cost of pen:"))
pencil_price = float(input("Cost of pencil:"))
eraser_price = float(input("Cost of eraser:"))
```

2. Next, we need to check if any of the prices are negative. If they are, we'll print an error message and stop the program. We can do this using an if statement.

```python
if a4sheet_price < 0 or pen_price < 0 or pencil_price < 0 or eraser_price < 0:
    print("Invalid input")
    exit()
```

3. If all the prices are positive, we'll print them out. We can use the print function for this, and we'll use string formatting to make sure the prices are displayed with two decimal places.

```python
print("Items Details")
print("A4sheet: {:.2f}".format(a4sheet_price))
print("Pen: {:.2f}".format(pen_price))
print("Pencil: {:.2f}".format(pencil_price))
print("Eraser: {:.2f}".format(eraser_price))
```

And that's it! This program will get the prices of four items from the user, check if any of them are negative, and then print out the prices with two decimal places. If any of the prices are negative, it will print an error message and stop.

Knowee AI · Accepted Answer