題目地址

測試點 2：k==1 number沒有s
測試點 3：12. 這種是合法的

#include<cstdio> #include<iostream> #include<string> using namespace std; int n; string s; bool check(string s) {if( (s[0]=='+'||s[0]=='-') && s.size()==1) return false;if(s[0]=='+'||s[0]=='-') s=s.substr(1);int k=0,index=0;for(int i=0;i<s.size();i++){if(s[i]=='.') k++,index=i+1;else if(s[i]<'0'||s[i]>'9') return false;}if(k>=2) return false;if(k==0) return true;if( (s.size()-index)>2 ) return false;return true; } int main(void) {cin>>n;double sum=0;int cnt=0;bool flag=false;for(int i=0;i<n;i++){cin>>s;if(check(s)) {double temp=stod(s);if(temp>=-1000.0&&temp<=1000.0) sum+=temp,cnt++,flag=true;else printf("ERROR: %s is not a legal number\n",s.c_str());}else printf("ERROR: %s is not a legal number\n",s.c_str());}if(flag&&cnt!=1) printf("The average of %d numbers is %.2lf\n",cnt,sum/cnt);else if(flag) printf("The average of %d number is %.2lf\n",1,sum);else printf("The average of 0 numbers is Undefined");return 0; } #include<bits/stdc++.h> using namespace std; int cnt,t; double sum; bool check(string s) {string temp=s;int k=0;if(temp[0]=='-'||temp[0]=='+') temp=temp.substr(1);for(int i=0;i<temp.size();i++){if(temp[i]=='.') k++;else if(temp[i]<'0'||temp[i]>'9') return false;}if(k>1) return false;if(k){int l=temp.find('.');int len=temp.size()-l-1;if(len>2) return false;}double a=stod(s);if(a>=-1000.0&&a<=1000.0) return true;else return false; } int main(void) {cin>>t;while(t--){string s; cin>>s;if(check(s)) cnt++,sum+=stod(s);else printf("ERROR: %s is not a legal number\n",s.c_str());}if(cnt>1) printf("The average of %d numbers is %.2lf",cnt,sum/cnt);else if(cnt==1) printf("The average of %d number is %.2lf",cnt,sum/cnt);else printf("The average of 0 numbers is Undefined");return 0; }

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