I have a string of numbers, need to convert to ints (ATOI?)

I tried the atoi function but it keeps going until it's not an int.

for example

Code:

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char s[5] = "12a12";

int p=atoi(&s[0]);

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would give me 12, but I need one.

s[0] - '0' will give the int value for characters in the range '0' - '9'

thnkx