> For C, all you need is simple arithmetic. I would say C and its standard library. For example, you have to convert an element of argv that contains only the

> For C, all you need is simple arithmetic. I would say C and its standard library. For example, you have to convert an element of argv that contains only the numerical characters from a char[] to an int. This requires a knowledge of power series in order to perform this confidently. If you have access to stdlib.h, all you do is use strtol() or one of its little brothers.