operatori + analog

[sketchbook_andrea] / programming / leap_year_functions / leap_year_functions.ino

diff --git a/programming/leap_year_functions/leap_year_functions.ino b/programming/leap_year_functions/leap_year_functions.ino
new file mode 100644 (file)
index 0000000..befac46
--- /dev/null
+++ b/programming/leap_year_functions/leap_year_functions.ino
@@ -0,0 +1,80 @@
+/**
+ * Program: find out is the user typed in a leap year. The code assumes
+ * the user is not an idiot and only types in numbers that are a valid
+ * year.
+ * Author: Dr. Purdum, Aug. 7, 2012
+ **/
+void setup()
+{
+  Serial.begin(9600);
+}
+void loop()
+{
+  if (Serial.available() > 0) {
+    int bufferCount;
+    int year;
+    char myData[20];
+    bufferCount = ReadLine(myData);
+    year = atoi(myData);
+    Serial.print("Year: ");
+    Serial.print(year);
+    if (IsLeapYear(year)) {
+      Serial.print(" is ");
+    } 
+    else {
+      Serial.print(" is not ");
+    }
+    Serial.println("a leap year");
+  }
+}
+// Convert to int
+/*****
+ * Purpose: Determine if a given year is a leap year
+ * Parameters:
+ * int yr              
+ * The year to test
+ * Return value:
+ * int                 
+ * 1 if the year is a leap year, 0 otherwise
+ *****/
+int IsLeapYear(int yr)
+{
+  if (yr % 4 == 0 && yr % 100 != 0 || yr % 400 == 0) {
+    return 1;   // It is a leap year
+  } 
+  else {
+    return 0;  
+    // not a leap year
+  }
+}
+/*****
+ * Purpose: Read data from serial port until a newline character is read ('\n')
+ * Parameters:
+ * char str[]
+ * character array that will be treated as a nul-terminated string
+ * Return value:
+ * int
+ * the number of characters read for the string
+ * CAUTION: This method will sit here forever if no input is read from the serial
+ * port and no newline character is entered.
+ ****/
+int ReadLine(char str[])
+{
+  char c;
+  int index = 0;
+  while (true) {
+    if (Serial.available() > 0) {
+      c = Serial.read();
+      if (c != '\n') {
+        str[index++] = c;
+      } 
+      else {
+        str[index] = '\0'; // null termination character
+        break;
+      }
+    }
+  }
+  return index;
+}
+
+