1 5dc21454 2023-07-14 jrmu /*
 2 5dc21454 2023-07-14 jrmu  * 2-4. Write an alternate version of squeeze(s1, s2) that deletes each
 3 5dc21454 2023-07-14 jrmu  * character in s1 that matches any character in the string s2.
 4 5dc21454 2023-07-14 jrmu  */
 5 5dc21454 2023-07-14 jrmu #include <stdio.h>
 6 5dc21454 2023-07-14 jrmu 
 7 5dc21454 2023-07-14 jrmu void squeeze(char s1[], char s2[]);
 8 5dc21454 2023-07-14 jrmu char * strchr(const char *s, int c);
 9 5dc21454 2023-07-14 jrmu 
10 5dc21454 2023-07-14 jrmu main () {
11 5dc21454 2023-07-14 jrmu 	char haystack[] = "The quick brown fox jumped over the lazy dog.";
12 5dc21454 2023-07-14 jrmu 	squeeze(haystack, "a");
13 5dc21454 2023-07-14 jrmu 	printf("a: %s\n", haystack);
14 5dc21454 2023-07-14 jrmu 	squeeze(haystack, "b");
15 5dc21454 2023-07-14 jrmu 	printf("b: %s\n", haystack);
16 5dc21454 2023-07-14 jrmu 	squeeze(haystack, "c");
17 5dc21454 2023-07-14 jrmu 	printf("c: %s\n", haystack);
18 5dc21454 2023-07-14 jrmu 	squeeze(haystack, "d");
19 5dc21454 2023-07-14 jrmu 	printf("d: %s\n", haystack);
20 5dc21454 2023-07-14 jrmu 	squeeze(haystack, "e");
21 5dc21454 2023-07-14 jrmu 	printf("e: %s\n", haystack);
22 5dc21454 2023-07-14 jrmu 	squeeze(haystack, "f");
23 5dc21454 2023-07-14 jrmu 	printf("f: %s\n", haystack);
24 5dc21454 2023-07-14 jrmu 	squeeze(haystack, "g");
25 5dc21454 2023-07-14 jrmu 	printf("g: %s\n", haystack);
26 5dc21454 2023-07-14 jrmu 	squeeze(haystack, "h");
27 5dc21454 2023-07-14 jrmu 	printf("h: %s\n", haystack);
28 5dc21454 2023-07-14 jrmu 	squeeze(haystack, "i");
29 5dc21454 2023-07-14 jrmu 	printf("i: %s\n", haystack);
30 5dc21454 2023-07-14 jrmu 	squeeze(haystack, "j");
31 5dc21454 2023-07-14 jrmu 	printf("j: %s\n", haystack);
32 5dc21454 2023-07-14 jrmu 	squeeze(haystack, "k");
33 5dc21454 2023-07-14 jrmu 	printf("k: %s\n", haystack);
34 5dc21454 2023-07-14 jrmu }
35 5dc21454 2023-07-14 jrmu 
36 5dc21454 2023-07-14 jrmu void squeeze(char s1[], char s2[]) {
37 5dc21454 2023-07-14 jrmu 	int i, j;
38 5dc21454 2023-07-14 jrmu 	for (i = j = 0; s1[i] != '\0'; ++i) {
39 5dc21454 2023-07-14 jrmu 		if (!strchr(s2, s1[i])) {
40 5dc21454 2023-07-14 jrmu 			s1[j++] = s1[i];
41 5dc21454 2023-07-14 jrmu 		}
42 5dc21454 2023-07-14 jrmu 	}
43 5dc21454 2023-07-14 jrmu 	s1[j] = '\0';
44 5dc21454 2023-07-14 jrmu }
45 5dc21454 2023-07-14 jrmu 
46 5dc21454 2023-07-14 jrmu char * strchr(const char *s, int c) {
47 5dc21454 2023-07-14 jrmu 	int i;
48 5dc21454 2023-07-14 jrmu 	for (i = 0; *(s+i) != c; ++i)
49 5dc21454 2023-07-14 jrmu 		if (*(s+i) == '\0')
50 5dc21454 2023-07-14 jrmu 			return 0;
51 5dc21454 2023-07-14 jrmu 	return s+i;
52 5dc21454 2023-07-14 jrmu }