1054. 求平均值 (20) PAT乙级&&1108. Finding Average (20)PAT甲级

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甲级传送门
乙级传送门

#include<stdio.h>#include<string.h>#include<stdlib.h>char str[110][1100];int main(){    int n;    int count=0;    double average=0;    scanf("%d",&n);    for(int i=0;i<n;i++){        bool isNumber=true;        int dot=0;        int dotnum=0;        scanf("%s",str[i]);        int len=strlen(str[i]);        for(int j=0;j<len;j++){            if(dot==1)  dotnum++;            if(str[i][j]=='-'&&j!=0){                isNumber=false;                break;            }            if(str[i][j]=='.'){                dot++;            }            else{                if((str[i][j]<'0'||str[i][j]>'9')&&(str[i][j]!='-')){                    isNumber=false;                    break;                }            }            if(dot>=2||dotnum>=3){                isNumber=false;                break;            }           }        double num=atof(str[i]);        if(num>1000||num<-1000){            isNumber=false;        }        if(isNumber){            count++;            average+=num;        }        else{            printf("ERROR: %s is not a legal number\n",str[i]);        }    }    if(count==0)        printf("The average of 0 numbers is Undefined");    else if(count==1)            printf("The average of %d number is %.2f",count,average);    else         printf("The average of %d numbers is %.2f",count,average/count);}

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