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3/ex2_6.c

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+#include <stdio.h>
+#define ONE 1
+#define FOUR 4
+#define ZERO 0
+#define TWO 2
+//---------------------------------------------------------------------------------------
+//                                              Exercise 2_6
+//                                              ------------
+//
+// General : The program performs the formula of the roots.
+//
+// Input   : 3 numbers (a,b,c from ax^2+bx+c).
+//
+// Process : The program performs the formula of the roots.
+//
+// Output  : 2 numbers (sign and result).
+//
+//---------------------------------------------------------------------------------------
+// Programmer : Cohen Idan
+// Student No : None
+// Date       : 19.09.2019
+//---------------------------------------------------------------------------------------
+void main(void)
+{
+    short num_a,
+          num_b,
+          num_c,
+          delta,
+          sign = ONE,
+          result = ZERO;
+
+    printf("Enter a,b,c from ax^2+bx+c: ");
+    scanf("%hd%hd%hd", &num_a, &num_b, &num_c);
+
+    // Calculate delta
+    delta = (num_b * num_b) - (FOUR * num_a * num_c); 
+    result = -num_b / TWO * num_a;
+    if (delta > ZERO)
+    {
+        sign = TWO;
+        result = ZERO;
+    }
+    if (delta < ZERO)
+    {
+        sign = ZERO;
+        result = ZERO;
+    }
+
+    printf("If you got sign '0' - not result\n\
+If you got sign '1' - one result\n\
+If you got sign '2' - two results:\nSign: %hd\nResult: %hd\n", sign, result);
+}