03-02: Exercises — for Loops¶

Notes reference: 03-02: for Loops

Q1: Basic range loop¶

Print the numbers 1 through 10, one per line.

Solution

for i in range(1, 11):
    print(i)

Q2: Loop over a string¶

Print each character of "Dhaka" on its own line, preceded by its index.

Solution

for i, ch in enumerate("Dhaka"):
    print(i, ch)
# 0 D
# 1 h
# 2 a
# 3 k
# 4 a

Q3: Sum with a loop¶

Calculate the sum of all integers from 1 to 100.

Solution

total = 0
for n in range(1, 101):
    total += n
print(total)   # 5050

# Alternative — built-in
print(sum(range(1, 101)))   # 5050

Q4: Loop over a list¶

Given scores = [88, 74, 95, 62, 79], print each score with a label "Pass" or "Fail" (pass if ≥ 70).

Solution

scores = [88, 74, 95, 62, 79]
for score in scores:
    label = "Pass" if score >= 70 else "Fail"
    print(f"{score}: {label}")

Q5: break and continue¶

Print numbers 1–20 but skip multiples of 4 and stop entirely when a multiple of 17 is reached.

Solution

for n in range(1, 21):
    if n % 17 == 0:
        break
    if n % 4 == 0:
        continue
    print(n)
# Prints: 1 2 3 5 6 7 9 10 11 13 14 15

Q6: for/else¶

Search for the first number divisible by both 7 and 11 in the range 1–100. Use for/else to handle the case where none is found.

Solution

for n in range(1, 101):
    if n % 7 == 0 and n % 11 == 0:
        print(f"Found: {n}")
        break
else:
    print("Not found in range")
# Found: 77

Q7: enumerate()¶

Given a list of cities, print each with a 1-based counter: "1. Dhaka", "2. Berlin", etc.

Solution

cities = ["Dhaka", "Berlin", "Tokyo", "Nairobi", "New York"]
for i, city in enumerate(cities, start=1):
    print(f"{i}. {city}")

Q8: zip()¶

Pair student names with their scores and print: "Alice: 91".

Solution

names  = ["Alice", "Bob", "Carol", "David"]
scores = [91, 78, 85, 62]
for name, score in zip(names, scores):
    print(f"{name}: {score}")

Q9: Nested loops — multiplication table¶

Print the 3 × 3 multiplication table (rows 1–3, cols 1–3).

Solution

for row in range(1, 4):
    for col in range(1, 4):
        print(f"{row * col:3}", end="")
    print()
#   1  2  3
#   2  4  6
#   3  6  9

Q10: range with step¶

Print all even numbers from 2 to 20, then count down from 10 to 1.

Solution

for n in range(2, 21, 2):
    print(n, end=" ")
# 2 4 6 8 10 12 14 16 18 20

print()

for n in range(10, 0, -1):
    print(n, end=" ")
# 10 9 8 7 6 5 4 3 2 1

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