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  1. #include <stdio.h>
  2.  
  3.  typedef struct main{
  4.    float weight; 
  5.    char*model; 
  6.    float maxspeed; 
  7. }Main;
  8.  
  9.  
  10. typedef struct airplane{
  11.    float weight; 
  12.    float maxspeed; 
  13.   }Airplane; 
  14.  
  15. typedef struct car{
  16.    float weight;
  17.    char*model;  
  18.    float maxspeed;  
  19. }Car;
  20.  
  21. int comparefunction(void*a,void*b){
  22.    Main a1, a2; 
  23.    a1=*(Main*)a;  
  24.    a2=*(Main*)b; 
  25.  
  26.    return a1.weight-a2.weight; 
  27. }
  28.  
  29. int main(void) {
  30. 	// your code goes here
  31. 	Airplane a;
  32. 	a.weight = 200;
  33. 	Car c;
  34. 	c.weight = 50;
  35. 	printf("%d", comparefunction((void*)&a, (void*)&c));
  36. 	return 0;
  37. }
  38.  
Success #stdin #stdout 0s 2052KB
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https://ideone.com/j9EdgO
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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