Reply to Re: C Programming Tutorial
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February 3rd 2006, 12:51 AM
toa
void val(string s, int x, int err);
If the chars contained by s were digits, then x would become the number value contained in s. If not, the err varaible would indicate the position of the first non-digit char.
Is anything similar in C? Can you indicate me a good tutorials about strings, in C?
strtol() or strtoul()
They're in either stdlib.h or string.h (I forget which).
If you want error checking:
errno = 0;
myval = strtol(s,NULL,0);
if (errno) { /*error-handling goes here*/; }
As for tutorials on strings in C:
Rule 1: Don't use string.h.
Rule 2: Don't use char* as a string type.
Rule 3: Find a good dynamic string library.
Rule 3 gives you your tutorial, since any good string lib will have documentation.
If the chars contained by s were digits, then x would become the number value contained in s. If not, the err varaible would indicate the position of the first non-digit char.
Is anything similar in C? Can you indicate me a good tutorials about strings, in C?
strtol() or strtoul()
They're in either stdlib.h or string.h (I forget which).
If you want error checking:
errno = 0;
myval = strtol(s,NULL,0);
if (errno) { /*error-handling goes here*/; }
As for tutorials on strings in C:
Rule 1: Don't use string.h.
Rule 2: Don't use char* as a string type.
Rule 3: Find a good dynamic string library.
Rule 3 gives you your tutorial, since any good string lib will have documentation.
