程序代码：

#include <stdio.h>
#include "7_2.h"
int main()
{
  int i,j;
  for (i = 10, j = 10; i > 4; --i, ++j)
      points('+', i, j);
  for (i+=2, j-=2; i<=j; ++i,--j)
      points('+', i, j);

  getchar();
  return 0;
}//函数定义头文件 7_2.h
void line(char c, int begin, int end)
{
    int i;
    for (i = 0; i < begin; ++i) putchar(' ');
    for ( ; i <= end; ++i) putchar(c);
    putchar('\n');
}
void points(char c, int first, int second)
{
    int i;
    for (i = 0; i < first; ++i)
       putchar(' ');
    putchar(c);
    for (++i ; i < second; ++i)
       putchar(' ');
    if (first < second)
       putchar(c);
    putchar('\n');
}