Logic Building/Phase 4 - Level 2: Searching & Counting Logic/Program

Find First Occurrence

Find index of first occurrence of element.

Logic BuildingIntermediate

Logic Building

# Take array
n = int(input("Enter array size: "))
arr = []
for i in range(n):
    arr.append(int(input(f"Element {i+1}: ")))

x = int(input("Enter element to find: "))

# Find first occurrence
if x in arr:
    index = arr.index(x)
    print(f"First occurrence at index: {index}")
else:
    print("Element not found")

Output

Enter array size: 5
Element 1: 10
Element 2: 20
Element 3: 30
Element 4: 20
Element 5: 40
Enter element to find: 20
First occurrence at index: 1

Use index() method to find first occurrence.

Key Concepts:

index(x) returns first index
Check existence first
Returns index of first match

Count Occurrences

Find Last Occurrence