zoukankan      html  css  js  c++  java
  • A1108. Finding Average

    The basic task is simple: given N real numbers, you are supposed to calculate their average. But what makes it complicated is that some of the input numbers might not be legal. A "legal" input is a real number in [-1000, 1000] and is accurate up to no more than 2 decimal places. When you calculate the average, those illegal numbers must not be counted in.

    Input Specification:

    Each input file contains one test case. For each case, the first line gives a positive integer N (<=100). Then N numbers are given in the next line, separated by one space.

    Output Specification:

    For each illegal input number, print in a line "ERROR: X is not a legal number" where X is the input. Then finally print in a line the result: "The average of K numbers is Y" where K is the number of legal inputs and Y is their average, accurate to 2 decimal places. In case the average cannot be calculated, output "Undefined" instead of Y. In case K is only 1, output "The average of 1 number is Y" instead.

    Sample Input 1:

    7
    5 -3.2 aaa 9999 2.3.4 7.123 2.35
    

    Sample Output 1:

    ERROR: aaa is not a legal number
    ERROR: 9999 is not a legal number
    ERROR: 2.3.4 is not a legal number
    ERROR: 7.123 is not a legal number
    The average of 3 numbers is 1.38
    

    Sample Input 2:

    2
    aaa -9999
    

    Sample Output 2:

    ERROR: aaa is not a legal number
    ERROR: -9999 is not a legal number
    The average of 0 numbers is Undefined

     1 #include<cstdio>
     2 #include<iostream>
     3 #include<string.h>
     4 using namespace std;
     5 char num[100];
     6 const double INF = 100000000.0;
     7 double prase_(char num[]){
     8     int len = strlen(num);
     9     int pos = -1, cnt = 0;
    10     int tag = 0;
    11     for(int i = 0; num[i] != ''; i++){
    12         if(!(num[i] >= '0' && num[i] <= '9' || num[i] == '.' || num[i] == '-')){
    13             return INF;
    14         }
    15         if(num[i] == '.')
    16             cnt++;
    17         if(cnt > 1)
    18             return INF;
    19     }
    20     if(num[0] == '-')
    21         tag = 1;
    22     for(pos = 0; num[pos] != '.' && num[pos] != ''; pos++);
    23     int P = 1, ansL = 0, ansR = 0;
    24     if(pos == ''){
    25         for(int i = len - 1; i >= tag; i--){
    26             ansL += (num[i] - '0') * P;
    27             P *= 10;
    28         }
    29         if(tag == 1)
    30             return ansL * -1.0;
    31         else return ansL * 1.0;
    32     }else{
    33         if(len - pos - 1 > 2)
    34             return INF;
    35         P = 1; ansL = 0;
    36         for(int i = pos - 1; i >= tag; i--){
    37             ansL += (num[i] - '0') * P;
    38             P *= 10;
    39         }
    40         P = 1; ansR = 0;
    41         for(int i = len - 1; i > pos; i--){
    42             ansR += (num[i] - '0') * P;
    43             P *= 10;
    44         }
    45         double temp = ansR * 1.0;
    46         for(int i = 0; i < len - pos - 1; i++){
    47             temp *= 0.1;
    48         }
    49         if(tag == 1)
    50             return ((double)ansL + temp) * -1.0;
    51         else return (double)ansL + temp;
    52     }
    53 }
    54 int main(){
    55     int N, cnt = 0;
    56     double sum = 0, temp = 0;
    57     scanf("%d", &N);
    58     for(int i = 0; i < N; i++){
    59         scanf("%s", num);
    60         temp = prase_(num);
    61         if(temp > 1000.0 || temp < -1000.0){
    62             printf("ERROR: %s is not a legal number
    ", num);
    63         }else{
    64             sum += temp;
    65             cnt++;
    66         }
    67     }
    68     if(cnt > 1){
    69         double prt = sum / (double)cnt;
    70         printf("The average of %d numbers is %.2f
    ", cnt, prt);
    71     }else if (cnt == 0){
    72         printf("The average of 0 numbers is Undefined
    ");
    73     }else if(cnt == 1){
    74         double prt = sum / (double)cnt;
    75         printf("The average of %d number is %.2f
    ", cnt, prt);
    76     }
    77     cin >> N;
    78     return 0;
    79 }
    View Code
  • 相关阅读:
    子类继承方法的重写
    操作系统的用户模式和内核模式
    Java中的CAS
    FaceBook SDK登录功能实现(Eclipse)
    eclipse集成ijkplayer项目
    android handler传递数据
    android发送短信
    hadoop中的job.setOutputKeyClass与job.setMapOutputKeyClass
    mysql对事务的支持
    使用jd-gui+javassist修改已编译好的class文件
  • 原文地址:https://www.cnblogs.com/zhuqiwei-blog/p/8570467.html
Copyright © 2011-2022 走看看