Class 8 Computer Science — Procedures that take values and give one back

1.Two calls happen one after the other here. What number does it print?

def treble(x):
    return x * 3

a = treble(3)
b = treble(a)
print(b)

2.This procedure multiplies and then adds. What number does it print?

def cost(n):
    return n * 5 + 2

print(cost(6))

3.A procedure named grow takes a number and gives back that number plus a tenth of it. Which of these calls gives 55?

• a) grow(50)
• b) grow(45)
• c) grow(60)
• d) grow(55)

4.One call sits inside another here. What number does it print?

def double(x):
    return x * 2

print(double(double(3)))

5.Follow this code by hand. What is total at the end?

def add(a, b):
    return a + b

total = 0
for n in range(1, 5):
    total = add(total, n)

6.This procedure has a loop inside it. What number does it print?

def upto(n):
    total = 0
    for k in range(1, n + 1):
        total = total + k
    return total

print(upto(5))

7.This procedure is handed two values rather than one. What number does it print?

def add(a, b):
    return a + b

print(add(4, 9))

8.This procedure takes something off what it is handed. What number does it print?

def less(x):
    return x - 5

print(less(30))