C / C++ / MFC

class Person
{
    Person *parent;

public:
    Person(Person *p){parent = p;}

};


int main()
{
    Person grandfather(nullptr);
    Person father(&grandfather);
    Person son(&father);

    // Do something here

    return 0;
}

<blockquote class="quote"><div class="op">Quote:</div>
#include<stdio.h>
#include<stdlib.h>



int main(int argc,int *argv[])
{
	srand(12345); // generate same random number anytime it run
       //srand((unsigned int)time NULL)
	int i,j;
	float a=0.2;
        double x;
        double sqrt(double);
        printf("========================================================\n");
	printf("Generated random number\t ||   Squaring of random number:\n"); 
	printf("=========================================================\n");
	for(i=0;i<100;i++)
		{
             	double f= ((float)rand()/(float)(RAND_MAX))*a; //rand return integer value from 0 to RAND_MAX(system dependent)
	
		printf("%f\t",f);
//		printf("%f\t",((float)rand()/(float)(RAND_MAX))*a); // rand return integer value from 0 to RAND_MAX(system dependent)
		 printf("\t\t%f\n",x*f);
//                printf("\t\t%f\n",f*f);
//              printf("\t\t%f\n",(((float)rand()/(float)(RAND_MAX))*a) * ((float)rand()/(float)(RAND_MAX) *a));
                }  
  
       
			FILE *fout;
			//FILE *square;
			fout=fopen("R_Number","w");  // output file in write mode
			j=0;
			
			srand(12345);                // to giving value 12345 generate same random number wen anytime it run
			
			while(j<100)                 // condition
			{ 
				 double f= ((float)rand()/(float)(RAND_MAX))*a;
  				 fprintf(fout,"%f\t\t\t%f\n",f,f*f);
  				 
			  //	 fprintf(fout,"%f\n",((float)rand()/(float)(RAND_MAX))*a); // print file in output mode
				j++;
			}
			fclose(fout);  // close the file

return 0;
}


double sqrt (double f) 
{
    double x, z, tempf;
    unsigned long *tfptr = ((unsigned long *)&tempf) + 1;
    tempf = f;
   *tfptr = (0xbfcdd90a - *tfptr)>>1; 
 x =  tempf;
 z =  f*0.5;                       
 x = (1.5*x) - (x*x)*(x*z);    //The more you make replicates of this statement 
                               //the higher the accuracy, here only 2 replicates are used  
  x = (1.5*x) - (x*x)*(x*z);       
  return x*f; 
  }  
</blockquote>