int N;

cout<<"Enter the number N";

cin>>N;

for(int j = (N/2),i=0;j>=0,i<=(N/2);i++,j--){

for(int k = 0;k<j;k++){

cout<<" ";

}

for(int k =0;k<=i;k++){

cout<<"*";

}

for(int k=0;k<i;k++){

cout<<"*";

}

cout<<endl;

}

for(int j = 1,i=(N/2);j<=(N/2),i>=0;i--,j++){

for(int k = 0;k<j;k++){

cout<<" ";

}

for(int k = 0;k<=i-1;k++){

cout<<"*";

}

for(int k = 0;k<i-1;k++){

cout<<"*";

}

cout<<endl;

}