array of structs

Author: ivanbrennan

prog.9.6.c

@@ -0,0 +1,54 @@
+// Program to illustrate arrays of structures
+
+#include <stdio.h>
+
+struct time
+{
+	int hour;
+	int minutes;
+	int seconds;
+};
+
+int main (void)
+{
+	struct time timeUpdate (struct time now);
+	struct time testTimes[5] = {
+		{ 11, 59, 59 }, { 12, 0, 0 }, { 1, 29, 59 },
+		{ 23, 59, 59 }, { 19, 12, 27 }
+	};
+	int i;
+
+	for ( i = 0; i < 5; ++i ) {
+		printf ("Time is %.2i:%.2i:%.2i", testTimes[i].hour,
+				testTimes[i].minutes, testTimes[i].seconds);
+
+		testTimes[i] = timeUpdate (testTimes[i]);
+
+		printf (" ...one second later it's %.2i:%.2i:%.2i\n",
+				testTimes[i].hour, testTimes[i].minutes, testTimes[i].seconds);
+	}
+
+	return 0;
+}
+
+// Function to update the time by one second
+
+struct time timeUpdate (struct time now)
+{
+	++now.seconds;
+
+	if ( now.seconds == 60 ) {		// next minute
+		now.seconds = 0;
+		++now.minutes;
+
+		if ( now.minutes == 60 ) {	// next hour
+			now.minutes = 0;
+			++now.hour;
+
+			if ( now.hour == 24 )	// midnight
+				now.hour = 0;
+		}
+	}
+
+	return now;
+}