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3/ex1.c

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+#include <stdio.h>
+
+#define SUM(a,b) a + b
+#define DIFFERENCE(a,b) a - b
+#define MULTIPLICATION(a,b) a * b
+#define DIVIDE(a,b) a / b
+//---------------------------------------------------------------------------------------
+//                                              Exercise 1
+//                                              ----------
+//
+// General : The program do math with two numbers and one operator.
+//
+// Input   : 2 numbers (results), 1 char.
+//
+// Process : The program checks the operator and process math on 2 numbers.
+//
+// Output  : 1 number.
+//
+//---------------------------------------------------------------------------------------
+// Programmer : Cohen Idan
+// Student No : None
+// Date       : 19.09.2019
+//---------------------------------------------------------------------------------------
+void main(void)
+{
+    float num1,
+          num2,
+          result;
+    char opr;
+    printf("Enter mathematical expression (a + b): ");
+    scanf("%f %c %f", &num1, &opr, &num2);
+    switch (opr)
+    {
+    case '-':
+        result = DIFFERENCE(num1, num2);
+        break;
+    case '/':
+        result = DIVIDE(num1, num2);
+        break;
+    case '*':
+        result = MULTIPLICATION(num1, num2);
+        break;
+    default:
+        result = SUM(num1, num2);
+        break;
+    }
+
+    printf("The result: %f\n", result);
+}