## ~josealberto4444/learning-C

e727e5c7055f8a53c105ce641b5e7c1e1eb4b1de — José Alberto Orejuela García 3 years ago
```Add exercise (2-5)

Exercise 2-5:
Write the function any(s1 ,s2), which returns the first location in the
string s1 where any character from the string s2 occurs, or -1 if s1
contains no characters from s2. (The standard library function strpbrk
does the same job but returns a pointer to the location.)
```
```1 files changed, 43 insertions(+), 0 deletions(-)

A 2-5/any.c
```
`A 2-5/any.c => 2-5/any.c +43 -0`
```@@ 0,0 1,43 @@
+#include <stdio.h>
+
+/* charinstring: check if char is in string */
+int
+charinstring(int c, char s[])
+{
+	int i;
+
+	for (i = 0; s[i] != '\0'; ++i) {
+		if (s[i] == c) {
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+/* htoi: returns the first location in the string s where any character from
+ * the string t occurs */
+int
+any(char s[], char t[])
+{
+	int i;
+
+	for (i = 0; s[i] != '\0'; ++i) {
+		if (charinstring(s[i], t)) {
+			return i;
+		}
+	}
+
+	return -1;
+}
+
+/* print some examples */
+int
+main()
+{
+	char s[] = "Hay una z en la posición número";
+
+	printf("%s %d.\n", s, any(s, "z"));
+
+	return 0;
+}

```