Please help me in this Q: Q1: Covert the follwing code from c++ to c, The code i

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Please help me in this Q:

Q1: Covert the follwing code from c++ to c, The code is using RSA algorithm

#include <stdio.h>

#include<iostream.h>

#include <conio.h>

#include<string.h>

#include<fstream.h>

#include<stdlib.h>

main()

{

long int i,j,ff,p,q,n,h,d,m,c=0,e,df,prime[1000],dv[100];

clrscr();

cout<<"Enter a Value for p :";

cin>>p;

cout<<" Enter a Value for q :";

cin>>q;

cout<<" Enter a value for m :";

cin>>m;

//======== Calculate n and (p-1)(q-1) Values

n=p*q;

h=(p-1)*(q-1);

//======== Generate the Prime Array

for (i=2;i<100;i++)

{

   int f=0;

   for(j=2;j<i-1;j++)

     if(i%j==0)

       f=1;

    if (f==0)

      {

       prime[c++]=i;

      }

}

int f=0;

for(i=0;i<c && f==0;i++)

{

   ff=h%prime[i];

   if( ff!=0)

     {

      e=prime[i];

      f=1;

     }

   }

   //============= Generate the Possible Values of ed

   dv[0]=h+1;c=0;

   for(i=1;i<100;i++)

    dv[i]=dv[i-1]+h;

    f=0;

   for(i=0;i<100 && f==0;i++)

     if(dv[i]%e==0)

       {

     d=dv[i]/e;

     f=1;

       }

   //============= Calculate the value of c

   df=1;

   for(i=0;i<e;i++)

      df=df*m;

   c=df%n;

   cout<<" ******** The Results ******** ";

   cout<<" The Value of e is :"<<e;

   cout<<" The Value of d is :"<<d;

   cout<<" The Public Key ("<<e<<","<<n<<")";

   cout<<" The Private Key ("<<d<<","<<n<<")";

   cout<<" The Value of c is :"<<c;

getch();

return 0;

}

Sample of the Result

Enter a Ualue for p :7 Enter a walue for q 11 Enter a value for m :6 The Results The value of e is :7 The Value of d is :43 The Public Key C7,77) The Private Key (43,77) The Value of c is :41

Explanation / Answer

C++ PROGRAM CONVERTED TO C CODE

#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <stdlib.h>

int main()

{

long int i,j,ff,p,q,n,h,d,m,c=0,f=0,e,df,prime[1000],dv[100],flag=0;

clrscr();

printf("Enter the Value for p :");
scanf("%ld",&p);

printf("Enter the Value for q :");
scanf("%ld",&q);

printf("Enter the Value for m :");
scanf("%ld",&m);

//======== Calculate n and (p-1)(q-1) Values

n=p*q;

h=(p-1)*(q-1);

//======== Generate the Prime Array

for (i=2;i<100;i++)

{

    flag=0;

   for(j=2;j<i-1;j++)

     if(i%j==0)

       flag=1;

    if (flag==0)

      {

       prime[c++]=i;

      }

}

for(i=0;i<c && f==0;i++)

{

   ff=h%prime[i];

   if( ff!=0)

     {

      e=prime[i];

      f=1;

     }

   }

   //============= Generate the Possible Values of ed

   dv[0]=h+1;c=0;

   for(i=1;i<100;i++)

    dv[i]=dv[i-1]+h;

    f=0;

   for(i=0;i<100 && f==0;i++)

     if(dv[i]%e==0)

       {

     d=dv[i]/e;

     f=1;

       }

   //============= Calculate the value of c

   df=1;

   for(i=0;i<e;i++)

      df=df*m;

   c=df%n;

   printf(" ******** The Results ******** ");
   printf(" The Value of e is :%ld",e);
   printf(" The Value of d is :%ld",d);
   printf(" The Public Key (%ld,%ld)",e,n);
   printf(" The Private Key (%ld,%ld)",d,n);
   printf(" The Value of c is :%ld",c);

getch();

return 0;

}

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