Summary:

The given C++ code defines a class Solution with a member function atoi that converts a string to an integer, mimicking the behavior of the standard library's atoi function. The code handles both positive and negative integers and checks for invalid characters in the string. The function returns the converted integer or -1 if the string contains non-numeric characters.

Solution:

Explanation:

• The atoi function takes a string s as input and converts it into an integer.

• It checks if the first character of the string is '-' to determine the sign of the integer.

• If the string is negative, it updates the sign variable and removes the '-' from the string using substr(1).

• The function then iterates through each character in the string, converting it to its numeric value and updating the final integer.

• If a non-numeric character is encountered during the iteration, the function returns -1, indicating an invalid input.

• Finally, the function returns the calculated integer value with the correct sign.

Answered by: >kjindalagg

Credit:> >Geeksforgeeks

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