写一个C语言 用栈实现算术运算

当然，我可以为您写出一个简单的C程序，用栈来实现基本的算术运算。下面是例子代码：

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

#define MAX_STACK_SIZE 100

int stack[MAX_STACK_SIZE];
int top = -1;

int pop()
{
if(top == -1)
printf("\nERROR: Stack is Empty!!!\n");
else
return(stack[top--]);
}

void push(int item)
{
if(top == (MAX_STACK_SIZE-1))
printf("\nERROR: Stack is Full!!!\n");
else
stack[++top] = item;
}

int main()
{
char expression[100];
char *p;
int num;

printf("Enter the expression: ");
scanf("%s", expression);

p = expression;

while(*p != '\0')
{
if(isdigit(*p))
{
num = *p - '0';
push(num);
}
else
{
switch(*p)
{
case '+':
push(pop() + pop());
break;
case '-':
push(pop() - pop());
break;
case '*':
push(pop() * pop());
break;
case '/':
push(pop() / pop());
break;
default:
printf("\nERROR: Invalid Expression!!!\n");
return 1;
}
}
p++;
}

printf("\nThe result of expression %s is %d\n", expression, pop());
return 0;
}

希望这个例子可以帮助您！