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A Program runs properly in my compiler and prints the right results, but can't compile in the compiler of a judge. The compiler of the judge says the following:
program.c: In function `int main()':
program.c:25: implicit declaration of function `int ltoa(...)'
--> 25: ltoa( a, string, 10);
I can't understand where the problem is.
The only libraries i use is <stdio.h> and <stdiib.h>.
Is there something wrong with my "ltoa" statement?
i would really appriciate it if you could help me.
Sorry, i mean <stdlib. h>
>Is there something wrong with my "ltoa" statement?
Yes, it's not a standard function. You shouldn't expect it to work on another compiler. However, an alternative solution that is standard is to use sprintf:
Code:sprintf(string, "%ld", a);
Thanks
1)Is it possible for their compiler not to have <stdlib.h> library? Remember it is a judge.
2)What’s the difference between “sprintf” and ”ltoa”
1)Is it possible for their compiler not to have <stdlib.h> library? Remember it is a judge.
2)What’s the difference between “sprintf” and ”ltoa”
No,stdlib.h is standard.Quote:
Originally posted by AProg
1)Is it possible for their compiler not to have <stdlib.h> library? Remember it is a judge.
sprintf is standard,itoa not.Quote:
2)What’s the difference between “sprintf” and ”ltoa”
itoa is a very simple function,converts int to string.
sprintf is very general,writes formatted data to a string (all kind of).
Btw. don't use sprintf if you have snprintf (notice the 'n').
sprintf is a buffer overflow candidate.
Why shouldn't i use sprintf if i have snprintf?
What is a buff?
A buffer overflow is when more data is written to the string than it can hold. Like if you had char x[10] and tried to write 15 characters to it.
snprintf allows you to specify the most data the buffer can hold. If more is going to be written, it is truncated.
>1)Is it possible for their compiler not to have <stdlib.h> library? Remember it is a judge.
Yes, it is, the C standard only specifies that a freestanding implementation supply <float.h>, <limits.h>, <stdarg.h>, and <stddef.h>. Though for a contest I would consider it very unlikely that you would have such restrictions.
>Btw. don't use sprintf if you have snprintf (notice the 'n').
Since standard conformance seems to be a biggie in this program, keep in mind that snprintf is only standard in C99 implementations. Otherwise its usage is not portable.