(HDU) 1202-The calculation of GPA (calculate GPA)

Title: http://vjudge.net/problem/HDU-1202

Analysis: This problem good pit father Ah, 80-89 4 points, let a person can't help set into 80<=i<=89, then 89.5 calculate not? There is also the need to consider all the missing test, division should have meaning.

1#include <cstdio>2#include <cstring>3#include <cmath>4#include <iostream>5#include <algorithm>6#include <string>7#include <cstdlib>8 9 using namespacestd;Ten  One intMain () A { -     intn,i; -     Doubles[10010],p[10010],sum_s,sum_p; the      while(~SCANF ("%d",&N)) -     { -sum_s=0, sum_p=0; -          for(i=1; i<=n;i++) +         { -scanf"%LF%LF",&s[i],&p[i]); +             if(p[i]==-1)Continue; A             Else at             { -                 if( -<=p[i]) p[i]=4; -                 Else if( the<=p[i]) p[i]=3; -                 Else if( -<=p[i]) p[i]=2; -                 Else if( -<=p[i]) p[i]=1; -                 Else if(0<=p[i]) p[i]=0; insum_s+=s[i],sum_p+=s[i]*P[i]; -             } to         } +         if(sum_s) printf ("%.2lf\n",1.0*sum_p/sum_s); -         Elseprintf"-1\n"); the     } *     return 0; $}

(HDU) 1202-The calculation of GPA (calculate GPA)