AVR Libc Library Reference
char* ltoa(long val, char *s, int radix)
char* utoa(unsigned int val, char *s, int radix)
char* ultoa(unsigned long val, char *s, int radix)
long random(void)
void srandom(unsigned long __seed)
long random_r(unsigned long *__ctx)
char* itoa(int val, char *s, int radix)
Highest number that can be generated by random().
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