main.c

来自「数据结构源码合集」· C语言 代码 · 共 51 行

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int *stack;
int top;

void STACKinit(int n)
{
	stack = malloc(n * sizeof(int));
	top = 0;
}

void STACKdestory()
{
	free(stack);
	top = 0;
}

void push(int item)
{
	stack[top++] = item;
}

int pop()
{
	return stack[--top];
}

int STACKempty()
{
	return top == 0;
}

int main(int argc, char *argv[])
{
	char *a = argv[1];
	int i;
	int N = strlen(a);
	STACKinit(N);
	for(i = 0; i < N; i++)
	{
		if(a[i] == '+')
			push(pop() + pop());
		if(a[i] == '*')
			push(pop() * pop());
		if(a[i] >= '0' && a[i] <= '9')
			push(0);
		while(a[i]