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Possible Duplicate:
convert string to integer in c++
Convert a no. from string to integer.
Eg: str:”1234″
convert to int a=1234;
i want the hint with proper explaination
The technique that this task is probably trying to get at is accessing each of the digits, e.g.,
str[0] - '0' = 1and multiply by their place values. But atoi is much faster!