1 files changed, 23 insertions, 0 deletions
diff --git a/7.9.c b/7.9.c
new file mode 100644
index 0000000..642efb1
--- /dev/null
+++ b/7.9.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+/* saves time (no function overhead) but uses more space
+ * since the macro is expanded on each call, also
+ * the argument can be evaluated twice and cause problems
+ * eg: isupper_m(p++), the soln is isupper(p); p++ */
+#define isupper_m(c) (c >= 'A' && c <= 'Z') ? 1 : 0
+
+/* uses more time bus saves on space */
+int isupper_f(char c);
+
+int main(void)
+{
+	printf("M: %d, m: %d\n", isupper_m('M'), isupper_m('m'));
+	printf("F: %d, f: %d\n", isupper_f('F'), isupper_f('f'));
+
+	return 0;
+}
+
+int isupper_f(char c)
+{
+	return (c >= 'A' && c <= 'Z') ? 1 : 0;
+}