#include <stdio.h>
#define MAXLINE 1000
long htoi(char s[]);
int main(void) {
int len;
char line[MAXLINE] = "0Xdead1234";
printf("%lu/n", htoi(line));
return 0;
}
long htoi(char s[])
{
long n = 0;
int c;
for (int i = 0; s[i] != '/0'; ++i) {
c = s[i];
if (i == 0 && c == '0' && (s[1] == 'x' || s[1] == 'X')) {
i = 1;
continue;
}
}
n *= 16;
if (c >= '0' && c <= '9')
n += c - '0';
else if (c >= 'a' && c <= 'f')
n += c - 'a';
else if (c >= 'A' && c <= 'F')
n += c - 'A';
return n;
}
原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/tech/pnotes/266574.html