4.1

1 files changed, 35 insertions, 0 deletions

diff --git a/4/1.c b/4/1.c
new file mode 100644
index 0000000..66c8f6e
--- /dev/null
+++ b/4/1.c
@@ -0,0 +1,35 @@
+#include <stdio.h>
+
+#define MAXLEN 1000
+
+/* finds the rightmost occurrence of t in s */
+int strindex(char s[], char t);
+
+int main(int argc, char *argv[]) {
+  int i, c, t;
+  char s[MAXLEN];
+
+  printf("source: ");
+  for (i = 0; i < MAXLEN - 1 && (c = getchar()) != '\n' && c != EOF; i++)
+    s[i] = c;
+  s[i] = 0;
+
+  printf("character: ");
+  t = getchar();
+  printf("index: %d\n", strindex(s, t));
+
+  return 0;
+}
+
+int strindex(char s[], char t) {
+  int i, index;
+
+  index = -1;
+
+  for (i = 0; s[i] != 0; i++) {
+    if (s[i] == t)
+      index = i;
+  }
+
+  return index;
+}
\ No newline at end of file