习题6.18

#include <stdio.h>
#include <stdlib.h>

int main()
{
int i,j;
for (i=1;i<=9;i++)
printf ("%3d",i);
printf ("\n");
printf ("  -  -  -  -  -  -  -  -  -");
printf("\n");
for (i=1;i<=9;i++)
{
for(j=1;j<=9;j++)
{
if (j<i)
printf ("   ");
if(j>=i)
printf ("%3d",i*j);
}
printf ("\n");
}

return 0;
}