UVa1586 Molar mass

#include <stdio.h>

int GetQuantity(char* q, char** p)
{
   int quantity = 0;
   while (*q && '0' <= *q && *q <= '9')
   {
       quantity = quantity*10 + (*q-'0');
       ++q;
   }
   if (quantity == 0)
       quantity = 1;
   *p = q;
   return quantity;
}

int main()
{
   int T, quantity;
   double mass;
   char str[81], *p;
   scanf("%d", &T);
   while (T--)
   {
       scanf("%s", str);
       mass = 0.0;
       p = str;
       while (*p)
       {
           if (*p == 'C')
           {
               quantity = GetQuantity(p+1, &p);
               mass += (12.01*quantity);
           }
           else if (*p == 'H')
           {
               quantity = GetQuantity(p+1, &p);
               mass += (1.008*quantity);
           }
           else if (*p == 'O')
           {
               quantity = GetQuantity(p+1, &p);
               mass += (16.00*quantity);
           }
           else if (*p == 'N')
           {
               quantity = GetQuantity(p+1, &p);
               mass += (14.01*quantity);
           }
           else
           {
               ++p;
           }
       }

       printf("%.3f\n", mass);
   }

return 0;
}

巴特西

UVa1586 Molar mass

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