【1108】Finding Average (20分)【字符串处理】

#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include<string.h>
#include<algorithm>  
#include<map>
#include<vector>
#include<queue> 
#include<string>
using namespace std;  
//利用ssprintf从字符串中读取相应格式的字符串
int main(){   
  int n,cnt=0;
  char a[50],b[50];
  double temp,sum=0.0;
  cin>>n;
  for(int i=0;i<n;i++){
    scanf("%s",a);
    sscanf(a,"%lf",&temp);
    sprintf(b,"%.2f",temp);
    int flag=0;
    for(int j=0;j<strlen(a);j++)
      if(a[j] != b[j])  flag=1;
    if(flag || temp< -1000 || temp>1000){
      printf("ERROR: %s is not a legal number\n",a);
      //continue;
    }else{
      sum += temp;
      cnt++;
    }
  }
  if(cnt ==1)
    printf("The average of 1 number is %.2f",sum);
  else if(cnt>1)
    printf("The average of %d numbers is %.2f",cnt,sum/cnt);
  else 
    printf("The average of 0 numbers is Undefined");
  system("pause");
    return 0;   
}