设计一个C++程序，使其能够打印出以下图形:

* * *
* * * * *
* * * * * * *
* * * * *
* * *

#include< iostream >
using namespace std;

int main()
{
int k = 1;
for( int i = 1; i >= 1; i += k )
{
for ( int j = 0; j <= 2*i; ++j )
printf( "* " );
putchar( '\n' );
if(i == 3) k = -1;
}
return 0;
}

或者:

#include< iostream >
using namespace std;

int main()
{
int k = 1;
for( int i = 1; i >= 1; i += k )
{
for ( int j = 0; j <= 5-i; ++j )
printf( " " );
for ( j = 0; j <= 2*i; ++j )
printf( "* " );
putchar( '\n' );
if(i == 3) k = -1;
}
return 0;
}

#include<stadio.h>

void main()

{

printf("* * *");

printf("* * * *");

printf("* * * * *");

printf("* * * *");

printf("* * *");

}