[C language] Transfer string to integer

[C language] Transfer string to integer



#include <stdio.h>

#include <stdlib.h>



void main(void)

{

        int addr;

        unsigned char *ptr;

        char a[20];



        printf("Please input a string");

        scanf("%s", a);



        addr = strtoul (a, (char **)&ptr, 16);

        printf("Addr = %x",addr);



}