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  1.  
  2. #include <stdio.h>
  3. #include <math.h>
  4. #include <string.h>
  5. #include <stdlib.h>
  6.  
  7.  
  8. struct argList{double* refVar; double val;};
  9.  
  10.  
  11. class Machine {
  12. 	typedef void (Machine::*oper)(void);
  13. 	double a,b;
  14. 	int NN,counter;
  15. 	oper* funcStack;
  16. 	argList* funcArgs;
  17.  
  18. public:
  19. 	Machine() {a=0;b=0;NN=0;funcArgs=NULL;funcStack=NULL;};
  20. 	Machine(int NN):counter(0) {
  21. 		a=0;b=0;funcArgs=NULL;funcStack=NULL;
  22. 		this->NN=NN;if(!funcArgs) funcArgs=new argList[NN];
  23. 	    if(!funcStack) funcStack=new oper[NN];};
  24. 	~Machine() {
  25. 		if(funcArgs) delete funcArgs;
  26. 		if(funcStack) delete funcStack;
  27. 	};
  28.  
  29. 	void meanArifGeom(void) {
  30. 		double x=0.5*(a+b);
  31. 		double y=sqrt(a*b);
  32. 		a=x;b=y;
  33. 		printf("x = %.10f  y = %.10f\n",a,b);
  34. 		return;
  35. 	};
  36.  
  37. 	void setVar(void) {
  38. 		argList* reff=&(funcArgs[counter]);
  39. 		*(reff->refVar)=reff->val;
  40. 		return;
  41. 	};
  42. 	void eval(char* ev) {
  43. 		char s1[80];double s2;
  44. 		char* eq=strstr(ev,"=");
  45. 		strncpy(s1,ev,(int)(eq-ev));s1[(int)(eq-ev)]=0;
  46. 		s2=atof(eq+1);
  47. 		funcStack[counter]=&Machine::setVar;
  48. 		argList* curr=&(this->funcArgs[counter]);
  49. 		if(!strcmp(s1,"a")) {curr->refVar=&a;} else {curr->refVar=&b;}
  50. 		curr->val=s2;counter++;
  51. 		return;
  52. 	};
  53. 	void calc(void) {
  54. 		funcStack[counter]=&Machine::meanArifGeom;
  55. 		counter++;
  56. 	};
  57. 	void runMachine(void) {
  58. 		int maxcount=counter;counter=0;
  59. 		while(counter<maxcount) {(this->*funcStack[counter])();counter++;}
  60. 	};
  61. 	void showState(void) {
  62. 		printf("a = %.10f  b = %.10f\n",a,b);
  63. 	};
  64. 	void setDirect(double x,double y) {a=x;b=y;};
  65. 	void showCount(void) {
  66. 		printf("c = %d\n",counter);
  67. 	};
  68. };
  69.  
  70.  
  71. int main(void)
  72. {
  73.  
  74. 	Machine mmm=Machine(10);
  75. 	mmm.eval("a=5");mmm.eval("b=17");
  76. 	mmm.calc();mmm.calc();mmm.calc();mmm.calc();mmm.calc();mmm.calc();
  77. 	mmm.runMachine();
  78. 	mmm.showState();
  79.  
  80. 	return 0;
  81. }
  82.  
  83.  
Success #stdin #stdout 0s 3456KB
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stdin
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Standard input is empty
stdout
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x = 11.0000000000  y = 9.2195444573
x = 10.1097722286  y = 10.0705009324
x = 10.0901365805  y = 10.0901174748
x = 10.0901270277  y = 10.0901270277
x = 10.0901270277  y = 10.0901270277
x = 10.0901270277  y = 10.0901270277
a = 10.0901270277  b = 10.0901270277
https://ideone.com/azzhVI
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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