Answer L37

#include <stdio.h>

void center(char ch, int count, int length)
{
  int blanks = length-count;
  int j;
  
  for ( j=0; j<blanks/2; j++ ) putchar( ' ' );
  for ( j=0; j<count;    j++ ) putchar( ch );
  
  putchar( '\n');
}


void truncTriangle(char ch, int base, int top, int line)
{
  int j;
  
  for ( j=top; j<=base; j+=2 )
    center( ch, j, line );
}

int main()
{
  truncTriangle('*', 13, 7, 23);  
  return 0;
}