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I have a char* array which looks like this "T 20" and I'd like to extract the "20" and convert it in to an integer. I was thinking of using atoi() but it seems that function will operate on the entire string, not just the bits I want. Memory is a bit tight so is there a function similar to atoi() which allows you to specify which charters to operate on?

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How about

char array[5] = "T 20";
int num = atoi(array+2);

This obviously assumes that all your strings are of the same format "A NN". If not, you can try parsing it using strtok(). See this excellent answer.

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