1 5dc21454 2023-07-14 jrmu /*
 2 5dc21454 2023-07-14 jrmu  * 2-5. Write the function any(s1,s2), which returns the first location in
 3 5dc21454 2023-07-14 jrmu  * the string s1 where any character from the string s2 occurs, or -1 if s1
 4 5dc21454 2023-07-14 jrmu  * contains no characters from s2. (The standard library function strpbrk
 5 5dc21454 2023-07-14 jrmu  * does the same job but returns a pointer to the location.)
 6 5dc21454 2023-07-14 jrmu  */
 7 5dc21454 2023-07-14 jrmu #include <stdio.h>
 8 5dc21454 2023-07-14 jrmu 
 9 5dc21454 2023-07-14 jrmu int any(char s1[], char s2[]);
10 5dc21454 2023-07-14 jrmu int strchr(const char *s, int c);
11 5dc21454 2023-07-14 jrmu 
12 5dc21454 2023-07-14 jrmu main () {
13 5dc21454 2023-07-14 jrmu 	printf("2: %d\n", any("The quick brown fox jumped over the lazy dog.", "aeiou"));
14 5dc21454 2023-07-14 jrmu 	printf("5: %d\n", any("The quick brown fox jumped over the lazy dog.", "aiou"));
15 5dc21454 2023-07-14 jrmu 	printf("6: %d\n", any("The quick brown fox jumped over the lazy dog.", "aio"));
16 5dc21454 2023-07-14 jrmu 	printf("12: %d\n", any("The quick brown fox jumped over the lazy dog.", "ao"));
17 5dc21454 2023-07-14 jrmu }
18 5dc21454 2023-07-14 jrmu 
19 5dc21454 2023-07-14 jrmu int any(char s1[], char s2[]) {
20 5dc21454 2023-07-14 jrmu 	int ret;
21 5dc21454 2023-07-14 jrmu 	for (int i = 0; s1[i] != '\0'; ++i)
22 5dc21454 2023-07-14 jrmu 		if (strchr(s2,s1[i]))
23 5dc21454 2023-07-14 jrmu 			return i;
24 5dc21454 2023-07-14 jrmu 	return -1;
25 5dc21454 2023-07-14 jrmu }
26 5dc21454 2023-07-14 jrmu int strchr(const char *s, int c) {
27 5dc21454 2023-07-14 jrmu 	int i;
28 5dc21454 2023-07-14 jrmu 	for (i = 0; *(s+i) != c; ++i)
29 5dc21454 2023-07-14 jrmu 		if (*(s+i) == '\0')
30 5dc21454 2023-07-14 jrmu 			return 0;
31 5dc21454 2023-07-14 jrmu 	return i;
32 5dc21454 2023-07-14 jrmu }