C strcpy and strcat -

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i have question strcpy , strcat.

in program i'm trying make need year born fiscal code. fiscal code given char serial port,

strcpy(temp, code[6]); strcat(temp, code[7]); yyyy = 1900 + (atoi(temp));

this came with: last 2 digits of year added 1900 (i know doesn't quite work people born in 2000). first digit copied full code temp variable using strcpy, add second digit use atoi , convert eveything integer; use strcat in way i've never seen before. doing right?

no need strcpy/strcat (and not appropriate in context anyway). no need temporary string either. can this:

yyyy = 1900 + (code[6] - '0') * 10 + (code[7] - '0');

this extracts 2 digit characters, converts each 1 integer in range 0..9, , calculates year these 2 values.


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