Triangle and Diamond in C++

#include <iostream>

using namespace std;

int main()

{

for (int i = 1; i<5; i++)

{

for (int j = 0; j < (2*i - 1); j++)

{

cout << "*";

}

cout << endl;

}

return 0;

}

//===============================================================================

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
int s = 10;
for (int i = 1; i<5; i++)
{
cout << setw(s);
s--;
for (int j = 0; j < (2*i - 1); j++)
{
cout << "*";
}

cout << endl;
}

return 0;
}
//===============================================================================

//===============================================================================

#include <iostream>
#include <iomanip>
using namespace std;

int main(){
int n = 4;
for (int i = 1; i<= 9; i++)
cout << "*";
cout << endl;

for (i = 1; i<4; i++){
cout << "*" << setw(n);
for (int j = 1; j<=2*i-1; j++)
cout << "*";
cout << setw(n) << "*";
cout << endl;
n--;
}
for (i = 1; i<= 9; i++)
cout << "*";
return 0;
}

Now write it by yourself, so that you can have grip on the working of loops which will help a lot in the future.