main.c

来自「在linux/UNIX上」· C语言 代码 · 共 79 行

/*main.c;
*		get a expression from the usr,and a '-' in its tail,
*		because we think '-' is the lowest valid operator;
*AUTHOR:[e-mail];
*VERSION:1.0;
*DATE:2006-8-9;
*/

#include "handle_opt.h"

/*the expresion's size */
#define EXP_SIZE 64

/*define the oprand_stack*/
stack_s oprand_stack;
/*define the operator_stack*/
stack_s operator_stack;						

int main()
{
	char input[EXP_SIZE];
	char operator_ch, operator_instack;
	char oprand_str[8];
	int input_len;
	int oprand_val;
	int i, j;
	
	oprand_stack.sp = 0;								/*initlize the stack sp; */
	operator_stack.sp = 0;

	printf("Please input you arithmatic expression:");
	scanf("%s", input);
	input_len = strlen(input);
	input[input_len] = '-';
	input_len++;
	j = 0;
	
	for (i = 0; i < input_len; i++)
	{
		if (input[i] >= '0' && input[i] <= '9')
		{
			oprand_str[j++] = input[i];
		}
		else
		{
			oprand_val = atoi(oprand_str);
			
			#ifdef DEBUG
			//printf("This val get is %d.\n", oprand_val);
			#endif
			
			if ('(' != input[i] && ')' != operator_ch)
				push(&oprand_stack, oprand_val);
			
			#ifdef DEBUG
			printf("This val put into stack is %d.\n", sp_value(&oprand_stack));
			#endif
			
			memset(oprand_str, '\0', 8);
			j = 0;
			operator_ch = input[i];
			
			switch (operator_ch)
			{
				case '(' : handle_left_b(operator_ch); break;
				case '^' : handle_pow(operator_ch); break;
				case '/' :
				case '*' : handle_multi(operator_ch);break;
				case '+' :
				case '-' : handle_add_and_sub(operator_ch); break;
				case ')' : handle_right_b(operator_ch); break;
				default  : break;
			}
		}
	}
	input[input_len-1] = '\0';
	printf("The value of %s is %d.\n", input, pop(&oprand_stack));
}