Finished 2.8

ch_02/exercise_02-05/main.c

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+/*
+ *
+ * Exercise 2-5. Write the function any(s1, s2), which returns the first location in a 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.)
+ *
+ * Author: Kun Deng
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+
+// Returns the first location in a string s1 where any character from string s2
+// occurrs, or -1 if s1 contains no characters from s2
+int any(char *s1, char *s2);
+
+
+int main(int argc, char **argv)
+{
+    char string_one[15] = "slipgunace";
+    char string_two[15] = "okayokayyeah";
+
+    if (argc > 3)
+    {
+        printf("Provide two arguments:\n");
+        printf("./program [string_one] [string_two]\n");
+
+        return -1;
+    }
+    else if (argc == 3)
+    {
+        int i;
+
+        for (i = 0; argv[1][i] != '\0'; ++i)
+        {
+            string_one[i] = argv[1][i];
+        }
+
+        string_one[i] = '\0';
+
+        for (i = 0; argv[2][i] != '\0'; ++i)
+        {
+            string_two[i] = argv[2][i];
+        }
+
+        string_two[i] = '\0';
+    }
+
+    printf("%15s%5s%15s\n", "String1", "|", "String2");
+    printf("%15s%5s%15s\n", string_one, "|", string_two);
+
+    // First index of String1 from a character of String2
+    int matching_index = any(string_one, string_two);
+
+    if (matching_index == -1)
+    {
+        printf("No matching characters from String2 found in String1\n");
+
+        return -1;
+    }
+
+    printf("Character %c is found in index %d of String1\n", string_one[matching_index], matching_index);
+
+    return 0;
+}
+
+
+int any(char *s1, char *s2)
+{
+    // Defaults to no matching found
+    int result = -1;
+
+    for (int i = 0; s2[i] != '\0'; ++i)
+    {
+        char val = s2[i];
+
+        for (int j = 0; s1[j] != '\0'; ++j)
+        {
+            if (val == s1[j])
+            {
+                result = j;
+                break;
+            }
+        }
+    }
+
+    return result;
+}