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TheAlgorithms/C++: others/postfix_evaluation.cpp Source File

!s.empty() && std::all_of(s.begin(), s.end(), ::isdigit);

*op = operation.c_str();

std::cout <<

;

<std::

N>

std::string scan = input[j];

std::array<std::string, 7> input = {

,

,

,

,

,

,

};

assert(answer == -4);

std::array<std::string, 9> input = {

,

,

,

,

,

,

,

,

};

assert(answer == 757);

std::cout <<

;

Creates an array to be used as stack for storing values.

int stackTop

Represents the index of the last value added to array. -1 means array is empty.

std::array< float, 20 > stack

Array which will be used to store numbers in the input.

for std::invalid_argument

std::shared_ptr< Node< value_type > > stackTop

Functions for Postfix Expression algorithm.

char pop()

pop a byte out of stack variable

bool is_number(const std::string &s)

Checks if scanned string is a number.

void evaluate(float a, float b, const std::string &operation, Stack *stack)

Evaluate answer using given last two operands from and operation.

static void test_function_2()

Test function 2 with input array {'1', '2', '+', '2', '/', '5', '*', '7', '+'}.

static void test_function_1()

Test function 1 with input array {'2', '3', '1', '*', '+', '9', '-'}.

void push(float operand, Stack *stack)

Pushing operand, also called the number in the array to the stack.

float postfix_evaluation(std::array< std::string, N > input)

Postfix Evaluation algorithm to compute the value from given input array.

int main()

Main function.

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