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| # Convert the string "123" into 123, without using the built-api `int()` | |
| # Startegy | |
| # 1. loop through each digit | |
| # 2. find the digit in range object of range(10) | |
| # 3. once the number is found, add it in placeholder | |
| # 4. Multiply each iteration by 10 (start with 0) | |
| def atoi(inputStr): | |
| outputNum = 0 | |
| for char in inputStr: | |
| for i in range(10): | |
| if str(i) == char: | |
| outputNum = outputNum * 10 + i | |
| return outputNum | |
| x = "123" | |
| y = atoi(x) | |
| print(y) |
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