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1/ex1.c

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+#include <stdio.h>
+
+#define DIGITS 3
+#define TEN 10
+#define ZERO 0
+//---------------------------------------------------------------------------------------
+//                                              Exercise 1
+//                                              ----------
+//
+// General : The program recognize if all digits are same.
+//
+// Input   : Number with 3 digits.
+//
+// Process : The program summarizes all the digits and divie by last digit.
+//
+// Output  : '0' if is it True, else is false.
+//
+//---------------------------------------------------------------------------------------
+// Programmer : Cohen Idan
+// Student No : None
+// Date       : 09.09.2019
+//---------------------------------------------------------------------------------------
+void main(void)
+{
+    short num,
+    temp,
+    sum = ZERO;
+
+    printf("Enter number with 3 digits: ");
+    scanf("%hd", &num);
+
+    // Take the first digit from right and add to sum
+    temp = num / TEN;
+    sum += num - (temp * TEN);
+    num = temp;
+
+    temp = num / TEN;
+    sum += num - (temp * TEN);
+    num = temp;
+
+    sum += num;
+
+    // Divie the sum by last digit from right and check if (Rest == 0) and
+    // (result == (count of digits))
+    temp = sum / num;
+    sum %= num;
+    sum = sum + DIGITS - temp;
+
+    printf("If you got '0' then it is True, else is False: %hd\n", sum);
+}