Question

c语言表达式求解问题.

http://tieba.baidu.com/p/4075617254
就是这个网站的问题。请帮忙找一下程序哪里出错了。

Answer 1

我这有敲好的
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <assert.h>

using namespace std;

unsigned int test_array[] =
{
1,2,3,4,5,6,7,8,9,10,
11,12,13,14,15,16,17,18,19,20,
21,22,23,24,25,26,27,28,29,30,
31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50,
51,52,53,54,55,56,57,58,59,60,
61,62,63,64,65,66,67,68,69,70,
71,72,73,74,75,76,77,78,79,80,
81,82,83,84,85,86,87,88,89,90,
91,92,93,94,95,96,97,98,99,100
};

/*+,-,*,/,(,),@,#*/
char cmp_table[][8] =
{
{'>','>','<','<','<','>','<','>'},
{'>','>','<','<','<','>','<','>'},
{'>','>','>','>','<','>','<','>'},
{'>','>','>','>','<','>','<','>'},
{'<','<','<','<','<','=','<','$'},
{'>','>','>','>','$','>','<','>'},
{'>','>','>','>','<','$','=','>'},
{'<','<','<','<','<','$','<','='}
};

int swap_table(char c)
{
switch(c)
{
case '+':return 0;
case '-':return 1;
case '*':return 2;
case '/':return 3;
case '(':return 4;
case ')':return 5;
case '@':return 6;
case '#':return 7;
}
return -1;
}

struct UNIT
{
unsigned int operand;
char _operator;
UNIT *next;
};
char cmp_operator(char a,char b)
{
return cmp_table[swap_table(a)][swap_table(b)];
}

int calc(char *sz);

void showlink(UNIT *start,int pStart)
{
while(start != NULL)
{
if(start->_operator != 0)
{
printf("%c ",start->_operator);
}
else
printf("%d ",start->operand);
start = start->next;
}
printf("\n");
}
void showarray(UNIT *start,int pStart)
{
int i;
for(i=0;i<pStart;i++)
{
if(start[i]._operator != 0)
{
printf("%c ",start[i]._operator);
}
else
printf("%d ",start[i].operand);
}
printf("\n");
}

int main()
{
char sz[1000];
while(1)
{
gets(sz);
printf("%d\n",calc(sz));
}
return 0;
}

int calc(char *sz)
{
bool is_innum = false,is_valid = true;
char *sz_p = sz,reg[4];
int i,pUnit = 0,result = 0,len = strlen(sz);
sz[len] = '#';
sz[len+1] = '\0';
len++;
UNIT *unit = (UNIT*)malloc(len*sizeof(UNIT));
memset(unit,0,len*sizeof(UNIT));

for(i=0;i<len && is_valid;i++)
{
switch(*sz_p)
{
case '+':
case '-':
case '*':
if(pUnit == 0 || (unit[pUnit-1]._operator != 0 && unit[pUnit-1]._operator != ')'))
{
unit[pUnit++]._operator = '@';
break;
}
case '/':
case '(':
case ')':
case '#':
is_innum = false;
sscanf(sz_p,"%c",&unit[pUnit++]._operator);
break;
case '%':
strncpy(reg,sz_p+1,3);
reg[3] = 0;
strupr(reg);
if(strcmp(reg,"EAX") == 0)
unit[pUnit++].operand = (unsigned int)(&test_array[0]);
else if(strcmp(reg,"EBX") == 0)
unit[pUnit++].operand = (unsigned int)(&test_array[10]);
else if(strcmp(reg,"ECX") == 0)
unit[pUnit++].operand = (unsigned int)(&test_array[20]);
else if(strcmp(reg,"EDX") == 0)
unit[pUnit++].operand = (unsigned int)(&test_array[30]);
else if(strcmp(reg,"ESI") == 0)
unit[pUnit++].operand = (unsigned int)(&test_array[40]);
else if(strcmp(reg,"EDI") == 0)
unit[pUnit++].operand = (unsigned int)(&test_array[50]);
else if(strcmp(reg,"ESP") == 0)
unit[pUnit++].operand = (unsigned int)(&test_array[60]);
else if(strcmp(reg,"EBP") == 0)
unit[pUnit++].operand = (unsigned int)(&test_array[70]);
else
is_valid = false;
i+=3;
sz_p+=3;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if(!is_innum)
{
is_innum = true;
sscanf(sz_p,"%d",&unit[pUnit++].operand);
}
break;
default:is_valid = false;break;
}
sz_p++;
}

UNIT *LinearTable = (UNIT*)malloc(pUnit*sizeof(UNIT));
memset(LinearTable,0,pUnit*sizeof(UNIT));
int pLinearTable = 0;
UNIT *Stack = (UNIT*)malloc(pUnit*sizeof(UNIT));
memset(Stack,0,pUnit*sizeof(UNIT));
int pStack = 0;
Stack[pStack++]._operator = '#';

//showarray(unit,pUnit);
i = 0;
while(is_valid && (Stack[pStack-1]._operator != '#' || unit[i]._operator != '#'))
{
//showarray(Stack,pStack);
//showarray(LinearTable,pLinearTable);
if(unit[i]._operator != 0)
{
if(cmp_operator(Stack[pStack-1]._operator,unit[i]._operator) == '$')
{
is_valid = false;
break;
}
while(pStack != 0 && cmp_operator(Stack[pStack-1]._operator,unit[i]._operator) == '>')
{
LinearTable[pLinearTable++]._operator = Stack[--pStack]._operator;
}
if(cmp_operator(Stack[pStack-1]._operator,unit[i]._operator) == '=')
{
if(Stack[pStack-1]._operator == '(' && unit[i]._operator == ')')
{
pStack--;
if(pStack >0 && Stack[pStack-1]._operator == '@')
{
LinearTable[pLinearTable++]._operator = Stack[--pStack]._operator;
}
}
}
if(cmp_operator(Stack[pStack-1]._operator,unit[i]._operator) == '<')
{
Stack[pStack++]._operator = unit[i]._operator;
}
}
else
{
LinearTable[pLinearTable++].operand = unit[i].operand;
}
if(unit[i]._operator != '#')
i++;
}

for(i=0;i<pLinearTable-1 && is_valid;i++)
{
LinearTable[i].next = &LinearTable[i+1];
}
LinearTable[i].next = NULL;

//printf("\narray:\n");
//showarray(LinearTable,pLinearTable);

UNIT *operand_1 = &LinearTable[0],*operand_2 = NULL,*pOperator = NULL;
assert(operand_1 != NULL);
while(is_valid && operand_1->next != NULL)
{
//printf("%d %d %c\n",operand_1->operand,operand_2->operand,pOperator->_operator);
//printf("calc:\n");
//showlink(LinearTable,0);
if(LinearTable[0].next->_operator == '@')
{
printf("is in @\n");
operand_2 = &LinearTable[0];
pOperator = LinearTable[0].next;
}
else if(LinearTable[0].next->next != NULL)
{
operand_2 = LinearTable[0].next;
pOperator = LinearTable[0].next->next;
}
else
is_valid = false;

while(pOperator != NULL && pOperator->_operator == 0)
{
operand_1 = operand_1->next;
operand_2 = operand_2->next;
pOperator = pOperator->next;
}

//showlink(LinearTable,0);

switch(pOperator->_operator)
{
case '@':
operand_2->operand = *((unsigned int *)(operand_2->operand));
operand_2->next = pOperator->next;
showlink(LinearTable,0);
break;
case '+':
operand_1->operand = operand_1->operand + operand_2->operand;
operand_1->next = pOperator->next;
break;
case '-':
operand_1->operand = operand_1->operand - operand_2->operand;
operand_1->next = pOperator->next;
break;
case '*':
operand_1->operand = operand_1->operand * operand_2->operand;
operand_1->next = pOperator->next;
break;
case '/':
operand_1->operand = operand_1->operand / operand_2->operand;
operand_1->next = pOperator->next;
break;
}
operand_1 = &LinearTable[0];
}

if(is_valid)
result = operand_1->operand;
else
result = -1;
free(LinearTable);
free(Stack);
free(unit);
return result;
}

Answer 2

//你的源代码

运行结果

没有出现错误,我尝试了好几个计算 ,没有出现问题.

追问

这是什么ide

我用VS和VC怎么都是错的

追答

vs 2010的 ，没有问题