下面是源代码:
#include <iostream>
using namespace std;
int main() {
int i,j,n;
cout<<"输入数字n:";
cin>>n;
for(i=1;i<=n;i++){
for(j=1;j<=n+1-i;j++){
cout<<" ";//这里是两个空格;
}
for(j=1;j<=2*i-1;j++){
cout<<" "<<i;
}
cout<<endl;
}
for(i=n-1;i>=1;i--){
for(j=1;j<=n+1-i;j++){
cout<<" ";//两个空格;
}
for(j=1;j<=2*i-1;j++){
cout<<" "<<i;
}
cout<<endl;
}
return 0;
}