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+====== Calculator ======
+**Concepts:**\\
+''switch'' statement
+**Text:**\\
+Realize a C program that:
+  * By using the ''switch'' statement, implements a simple calculator
+  * The program receives as input two float numbers (i.e., the //operands//) and a character (i.e., the mathematical operator)
+  * The calculator must executed the operation expressed by the //operator// and print the result of the operation
+  * Allowed operators are ''+'', ''-'', ''*'' and ''/''.
+  * Finally, the program must signal an error in the case an incorrect operator is inserted by the user.
+**Example**:\\
+<code>
++9
+RESULT: 3.000000 + 9.000000 = 12.000000
+^9
+ERROR: operator '^' not recognized
+</code>
+**Solution:**\\
+<file C calc.c>
+#include <stdio.h>
+int main() {
+  float op1, op2, ris;
+  char oper;
+  int operator_is_recognized = 1;
+  scanf("%f %c %f", &op1, &oper, &op2);
+  switch(oper) {
+  case '+':
+    ris = op1 + op2;
+    break;
+  case '-':
+    ris = op1 - op2;
+    break;
+  case '*':
+    ris = op1 * op2;
+    break;
+  case '/':
+    ris = op1 / op2;
+    break;
+  default:
+    operator_is_recognized = 0;
+  }
+  if (operator_is_recognized)
+    printf("RESULT: %f %c %f = %f\n", op1, oper, op2, ris);
+  else
+    printf("ERROR: operator '%c' not recognized\n", oper);
+  return 0;
+}
+</file>

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