The best replacement for atoi is stoi.

The best alternatives to atoi are rated as following:
★★★★★  stoi
★★★★  sscanf
★★★  lexical_cast
★★  stringstream
★★  strtol

Your alternative for atoi is not listed? Suggest!
Speaking about atoi, one probably shouldn't forget about char.

Other search terms related to atoi and their ratings are:
★★★★★ char
You have in mind a companion for atoi and it is not yet here? Propose!



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atoi
stoi
sscanf