Question

В про­грам­ме «:=» обо­зна­ча­ет опе­ра­тор присваивания, знаки «+», «-», «*» и «/» — соответственно опе­ра­ции сложения, вычитания, умно­же­ния и деления. Пра­ви­ла вы­пол­не­ния опе­ра­ций и по­ря­док дей­ствий со­от­вет­ству­ют пра­ви­лам арифметики. Опре­де­ли­те зна­че­ние пе­ре­мен­ной a после вы­пол­не­ния алгоритма: b := 4 a := -3 b := 7 - 2*a - b a := b/3 - a найти а

Answer 1

B=4
a=-3
b=7-2*(-3)-4=9
a=9/3-3=0

Answer 2

Understanding the Algorithm

In the given algorithm, the program uses the symbols ":=" to denote the assignment operator, and the symbols "+", "-", "*", and "/" to represent addition, subtraction, multiplication, and division operations, respectively. The rules for performing these operations and the order of operations correspond to the rules of arithmetic.

Step-by-Step Execution

1. Step 1: Initialize the variable b to 4: - b := 4 2. Step 2: Assign the value of -3 to the variable a: - a := -3 3. Step 3: Update the value of b to 7 minus 2 times the value of a minus b: - b := 7 - 2 * a - b 4. Step 4: Update the value of a to the result of b divided by 3 minus the current value of a: - a := b / 3 - a

Calculating the Final Value of a

To find the final value of variable a, we need to execute the algorithm step by step.

1. Step 1: b := 4 2. Step 2: a := -3 3. Step 3: b := 7 - 2 * (-3) - 4 - b = 7 + 6 - 4 - b = 9 4. Step 4: a := 9 / 3 - (-3) - a = 3 - (-3) - a = 3 + 3 - a = 6

Final Result

After executing the given algorithm, the value of variable a is 6.