C Tutorial/stdlib.h/strtoul
strtoul
Item Value Header
- include <stdlib.h>
Declaration unsigned long int strtoul(const char *start, char **end, int radix); Function converts the string into an unsigned long int according to the base of the number.
- If radix is zero, the base is determined by the rules that govern constant specification.
- If the radix is specified, it must be in the range 2 through 36.
Reads unsigned base 16 (hexadecimal) numbers from standard input and returns their unsigned long equivalent:
#include <stdlib.h>
int main(void){
char *start, *end;
char a[100];
end = a;
*start= "12341234";
printf("%d", strtoul(start, &end, 8));
}