• 1108 Finding Average (20 分)


    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 [−] 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 (≤). 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 Undefinedinstead 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
    #include<iostream>
    #include<cstring>
    
    int main(){
        int n;
        scanf("%d",&n);
        double temp,sum = 0.0;
        int cnt = 0;
        char a[50],b[50];
        for(int i = 0 ; i < n; i++){
            scanf("%s",a);
            sscanf(a,"%lf",&temp);
            sprintf(b,"%.2f",temp);
            bool flag = true;
            for(int j = 0; j < strlen(a); j++){
                if(a[j] != b[j]){
                    flag = false;
                    break;
                }
            }
            if(flag && temp <= 1000 && temp >= -1000){
                cnt++;
                sum += temp;
            }else{
                printf("ERROR: %s is not a legal number
    ",a);
            }
        }
        if(cnt == 0){
            printf("The average of 0 numbers is Undefined
    ");
        }else if(cnt == 1){
            printf("The average of 1 number is %.2f",sum);
        }else{
            printf("The average of %d numbers is %.2f",cnt,sum/cnt);
        }
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/wanghao-boke/p/10447508.html
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