centralized performance resources

perf-cpp/scripts/ch4.cc

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+/*
+   Write the following program: The user is asked to enter 2 floating point numbers (use doubles). The user is then asked to enter one of the following mathematical symbols: +, -, *, or /. The program computes the answer on the two numbers the user entered and prints the results. If the user enters an invalid symbol, the program should print nothing.
+   */
+
+#include <iostream>
+
+int main() {
+  double x, y;
+  std::cout << "enter x: "<<'\n';
+  std::cin >> x;
+  std::cout << "enter x: "<<'\n';
+  std::cin >> y;
+  std::cout << "enter symbol " << '\n';;
+  char symbol;
+  std::cin >> symbol;
+
+  double ans;
+  switch (symbol) {
+    case '+':
+      ans = x + y;
+      break;
+    case '-':
+      ans = x - y;
+      break;
+    case '*':
+      ans = x * y;
+      break;
+    case '/':
+      ans = x / y;
+      break;
+    default:
+      return 0;
+  }
+
+
+  std::cout << "answer: " << ans << '\n';
+  return 0;
+}