Exerc 5_04.

chapter_5.pointers_arrays/5_04.strend/Makefile

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+BINARY=strend
+
+include ../../Makefile.exerc

chapter_5.pointers_arrays/5_04.strend/main.c

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+# include <stdio.h>
+# include "strend.h"
+
+
+void test (char *s, char *t)
+{
+  printf("strend(\"%s\", \"%s\") => %d\n", s, t, strend(s, t));
+}
+
+
+int main ()
+{
+  char s[] = "Write the function";
+
+  test(s, "");
+  test(s, "n");
+  test(s, "x");
+  test(s, "nn");
+  test(s, "ion");
+  test(s, "enction");
+  test(s, "Write");
+  test(s, "1. Write the function");
+  test(s, " Write the function");
+  test(s, "Write the function");
+  test(s, "function");
+  test(s, " function");
+  test(s, "ite the function");
+
+  return 0;
+}

chapter_5.pointers_arrays/5_04.strend/strend.c

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+
+/*
+  strend:
+    returns 1 if the string t occurs at the end of the string s,
+    and zero otherwise
+*/
+int strend (char *s, char *t)
+{
+  char *ts = s, *tt = t;
+  while (*ts++ != '\0')
+    ;
+  ts--;
+  while (*tt++ != '\0')
+    ;
+  tt--;
+  while (s <= ts && t <= tt && *ts == *tt) {
+    ts--;
+    tt--;
+  }
+  return tt < t;
+}

chapter_5.pointers_arrays/5_04.strend/strend.h

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+# ifndef STREND_H
+# define STREND_H
+
+/*
+  strend:
+    returns 1 if the string t occurs at the end of the string s,
+    and zero otherwise
+*/
+int strend (char *s, char *t);
+
+# endif

chapter_5.pointers_arrays/5_04.strend/tests/0_write_the_function.tout

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+strend("Write the function", "") => 1
+strend("Write the function", "n") => 1
+strend("Write the function", "x") => 0
+strend("Write the function", "nn") => 0
+strend("Write the function", "ion") => 1
+strend("Write the function", "enction") => 0
+strend("Write the function", "Write") => 0
+strend("Write the function", "1. Write the function") => 0
+strend("Write the function", " Write the function") => 0
+strend("Write the function", "Write the function") => 1
+strend("Write the function", "function") => 1
+strend("Write the function", " function") => 1
+strend("Write the function", "ite the function") => 1