如下的代码是关于C语言基础：结构体及指针使用演示的代码。

#include <stdio.h>

struct Shape {
  int type;
  int color;
  float radius;
  float area;
  float perimeter;
};

 {
   shape->type = 0;
   shape->color = 1;
   shape->radius = 5.0;
 }

int main(void)
 {
   struct Shape circle;

   change_structure(&circle);

   printf("circle.type %dn", circle.type);
   printf("circle.color %dn", circle.color);
   printf("circle.radius %f circle.area %f circle.perimeter %fn",
     circle.radius, circle.area, circle.perimeter);

return 1;
 }

输出结果

circle.type 0
circle.color 1
circle.radius 5.000000 circle.area 78.571426 circle.perimeter 31.428572