C examples for Data Type:int
Converts a string of hexadecimal digits into its equivalent integer value
#include <stdio.h> #define MAXLINE 1000/*from w w w . ja v a 2 s . c o m*/ 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; }