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C is not my 'native' language, so I'm asking what the most efficient way to validate a string as containing a numeric value is. The ato?() and sscanf() functions just stop when they encounter a non-numeric, but do not tell you that they did. I need to verify that a string contains a valid numeric value. (I.E. " +100" not "1 + 00" nor even "1+00 ", let alone "BOB ") (ato?() & sscanf() would return NULL or 1 in each case.)
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