实心菱形

 1 #include <iostream>
 2 using namespace std;
 3 int main(){
 4 int n;
 5 cin >> n;
 6 if(0<n&&n<=10){
 7 for(int i=1;i<=n;i++){
 8 for (int j=1;j<=(2*n-1);j++){ 
 9       if (j>n-i && j<n+i) {
10         cout<<"*";
11       } 
12       else{
13         cout<<" ";
14       }
15     }
16     cout<<endl;
17 }
18 for (int i=n-1;i>= 1;i--){
19     for (int j=1;j<=(2*n-1);j++){
20       if (j>n-i && j<n+i){
21         cout<<"*";
22       } 
23       else {
24         cout<<" ";
25       }
26     }
27     cout<<endl;
28     }
29     } 
30 }