Revert "fix: handle wrong inputs in postfix_evaluation (TheAlgorithms#3005)"

This reverts commit 2ea98ce.

Author: realstealthninja

others/postfix_evaluation.cpp

@@ -77,17 +77,6 @@ void evaluate(float a, float b, const std::string &operation,
     }
 }
 
-namespace {
-float remove_from_stack(std::stack<float> &stack) {
-    if (stack.empty()) {
-        throw std::invalid_argument("Not enough operands");
-    }
-    const auto res = stack.top();
-    stack.pop();
-    return res;
-}
-}  // namespace
-
 /**
  * @brief Postfix Evaluation algorithm to compute the value from given input
  * array
@@ -102,18 +91,18 @@ float postfix_evaluation(const std::vector<std::string> &input) {
             stack.push(std::stof(scan));
 
         } else {
-            const auto op2 = remove_from_stack(stack);
-            const auto op1 = remove_from_stack(stack);
+            const float op2 = stack.top();
+            stack.pop();
+            const float op1 = stack.top();
+            stack.pop();
 
             evaluate(op1, op2, scan, stack);
         }
     }
 
-    const auto res = remove_from_stack(stack);
-    if (!stack.empty()) {
-        throw std::invalid_argument("Too many operands");
-    }
-    return res;
+    std::cout << stack.top() << "\n";
+
+    return stack.top();
 }
 }  // namespace postfix_expression
 }  // namespace others
@@ -155,46 +144,6 @@ static void test_function_3() {
     assert(answer == 22);
 }
 
-static void test_single_input() {
-    std::vector<std::string> input = {"1"};
-    float answer = others::postfix_expression::postfix_evaluation(input);
-
-    assert(answer == 1);
-}
-
-static void test_not_enough_operands() {
-    std::vector<std::string> input = {"+"};
-    bool throws = false;
-    try {
-        others::postfix_expression::postfix_evaluation(input);
-    } catch (std::invalid_argument &) {
-        throws = true;
-    }
-    assert(throws);
-}
-
-static void test_not_enough_operands_empty_input() {
-    std::vector<std::string> input = {};
-    bool throws = false;
-    try {
-        others::postfix_expression::postfix_evaluation(input);
-    } catch (std::invalid_argument &) {
-        throws = true;
-    }
-    assert(throws);
-}
-
-static void test_too_many_operands() {
-    std::vector<std::string> input = {"1", "2"};
-    bool throws = false;
-    try {
-        others::postfix_expression::postfix_evaluation(input);
-    } catch (std::invalid_argument &) {
-        throws = true;
-    }
-    assert(throws);
-}
-
 /**
  * @brief Main function
  * @returns 0 on exit
@@ -203,10 +152,6 @@ int main() {
     test_function_1();
     test_function_2();
     test_function_3();
-    test_single_input();
-    test_not_enough_operands();
-    test_not_enough_operands_empty_input();
-    test_too_many_operands();
 
     std::cout << "\nTest implementations passed!\n";