The problem is to determine the output of the given Pascal program. The program initializes a variable $a$ to 0, then iterates through a loop where $b$ goes from 1 to 7. Inside the loop, $a$ is updated by adding $b$ to it, and the new value of $a$ is printed.

1. Problem Description

The problem is to determine the output of the given Pascal program. The program initializes a variable $a$ to 0, then iterates through a loop where $b$ goes from 1 to

7. Inside the loop, $a$ is updated by adding $b$ to it, and the new value of $a$ is printed.

2. Solution Steps

Let's trace the execution of the program:

- Initialize $a = 0$.

- Loop from $b = 1$ to $7$:

- $b = 1$: $a = a + b = 0 + 1 = 1$. Print $a = 1$.

- $b = 2$: $a = a + b = 1 + 2 = 3$. Print $a = 3$.

- $b = 3$: $a = a + b = 3 + 3 = 6$. Print $a = 6$.

- $b = 4$: $a = a + b = 6 + 4 = 10$. Print $a = 10$.

- $b = 5$: $a = a + b = 10 + 5 = 15$. Print $a = 15$.

- $b = 6$: $a = a + b = 15 + 6 = 21$. Print $a = 21$.

- $b = 7$: $a = a + b = 21 + 7 = 28$. Print $a = 28$.

3. Final Answer

The output of the program is:

1

3

6

10

15

21

28