839.2011.c.十一.2

#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#define MAXN 100
char str[MAXN];
int num,ratio;


char* (char *s, int *n1, int *flag)
{
    if(isalpha(*s))
    {
        *n1 = 1,*flag = 0;
        return s+1;
    }
    if((*s == '+' || *s == '-') && isalpha(*(s+1)))
    {
        *n1 = (*s=='+'?1:-1), *flag = 0;
        return s+2;
    }
    char ch;
    int sgn = 1;
    *n1 = *flag = 0;
    while(*s)
    {
        ch = *s++;
        if(ch == '+') sgn *= 1;
        if(ch == '-') sgn *= -1;
        if(isdigit(ch)) *n1 = (*n1)*10 + (ch - '0');
        if(isalpha(*s) || *s == '+' || *s == '-')
            break;
    }
    (*n1) *= sgn;
    if(isalpha(*s))
    {
        *flag = 0;
        return s+1;
    }
    *flag = 1;
    return s;
}

void process(char * hequ)
{
    int n1 = 0,flag = 0;
    while(*hequ)
    {
        hequ = getV(hequ, &n1, &flag);
        if(flag) num += n1;//flag=1表示是数字
        else ratio += n1;//flag=0表示是变量
    }
}

double calcEquation(char* equation)
{
    int len = strlen(equation);
    char *p1 = equation;
    char *p2 = NULL;
    for(int i = 0; i < len; ++i)
    {
        if(equation[i] == '=')
        {
            p2 = equation+i+1;
            equation[i] = '