P51-15

15.

<pre name="code" class="cpp">#include <stdio.h>int main(){int i,j,k;    int n;    scanf("%d",&n);    for(i=0;i<n;i++)     {       for(j=0;j<n-i;j++)       printf(" ");       for(k=0;k<=i;k++)       printf(" *");       printf("\n");       }       return 0 ;   }

<pre name="code" class="cpp">#include <stdio.h>int main(){int i,j,k;    int n;    scanf("%d",&n);    for(i=0;i<n;i++)     {       for(j=0;j<=i;j++)       printf(" ");       for(k=0;k<n-i;k++)       printf(" *");       printf("\n");       }        return 0;}