initial commit

README.md

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+# CITS3007 labs
+
+Lab solutions. Code modified from sources at the [CITS3007 Github](https://github.com/cits3007).
+
+NOTICE - These labs are not assessed and are publically available material. There should be NO issues of plagarism keeping this repository public.

lab01-leap-year/.gitignore

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+.*.swp
+*.o
+test_leap

lab01-leap-year/Makefile

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+
+CFLAGS = -pedantic -Wall -Wextra
+
+all: test_leap
+
+test_leap: test_leap.o
+
+test_leap.o:
+

lab01-leap-year/README.md

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+# CITS3007 lab 1 demo repository – leap year
+
+This repository contains a Makefile and C code for a program (`test_leap`)
+intended to show whether a year (supplied as a command-line argument) is a leap
+year or not.
+
+## Building
+
+Build with `make`.
+
+## Use
+
+The program can be run by supplying a year as a command-line argument:
+
+```
+$ ./test_leap 1901
+1901 is not a leap year
+```
+
+

lab01-leap-year/test_leap.c

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+
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+
+/* return 0 (false) or 1 (true), depending on whether
+ * `year` is a leap year or not.
+ */
+int is_leap(long year) {
+
+  if (year % 4 != 0) {
+    return 0;
+  }
+
+  if (year % 100 == 0) {
+    return 1;
+  }
+
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  argc--;
+  argv++;
+
+  if (argc != 1) {
+    fprintf(stderr, "Error: expected 1 command-line argument (a YEAR), but got %d\n", argc);
+    exit(1);
+  }
+
+  char *end;
+
+  // clear errno so we can check whether strtol fails
+  errno = 0;
+  long year = strtol(argv[0], &end, 10);
+  int res_errno = errno;
+
+  if (end == argv[0]) {
+    fprintf(stderr, "Error: couldn't interpret '%s' as a number\n", argv[0]);
+    exit(1);
+  } else if (res_errno == ERANGE) {
+    fprintf(stderr, "Error: '%s' is outside the range of numbers we can handle\n", argv[0]);
+    exit(1);
+  } else {
+    if (is_leap(year)) {
+      printf("%ld is a leap year\n", year);
+    } else {
+      printf("%ld is not a leap year\n", year);
+    }
+  }
+
+}
+