class net id ---------PK

#include<stdio.h>

#include<math.h>

int main()

{

char cl;

  int b1,b2,b3,b4;

  int d1,d2,d3,d4;

  int bd1,bd2,bd3,bd4;

  int s;

  printf("\nEnter 1st byte : ");

  scanf("%d",&b1);

    printf("\nEnter 2nd byte : ");

  scanf("%d",&b2);

  printf("\nEnter 3rd byte : ");

  scanf("%d",&b3);

  printf("\nEnter 4th byte : ");

  scanf("%d",&b4);

  printf("\nEnter No. of subnets : ");

  scanf("%d",&s);

  if(b1>255 || b1<0 || b2>255 || b2<0 || b3>255 || b3<0 || b4>255 || b4<0)

  {

  printf("\nInvalid IP");

}

  printf("IP address is : %d.%d.%d.%d",b1,b2,b3,b4);

  if(b1>0 && b1<=127)

  {

  cl='A';

  printf("\nClass A");

d1=255;

d2=0;

d3=0;

d4=0;

}

else if(b1>127 && b1<=191)

  {

  cl='B';

  printf("\nClass B");

d1=255;

d2=255;

d3=0;

d4=0;

}

else if(b1>191 && b1<=223)

  {

  cl='C';

  printf("\nClass C");

d1=255;

d2=255;

d3=255;

d4=0;

}

else if(b1>223 && b1<=239)

  {

  cl='D';

  printf("\nClass D");

d1=255;

d2=255;

d3=255;

d4=255;

}

else

{

printf("\nClass E");

}

printf("\nDefault Mask is : %d.%d.%d.%d",d1,d2,d3,d4);

int n1,n2,n3,n4;

n1=b1&d1;

n2=b2&d2;

n3=b3&d3;

n4=b4&d4;

printf("\nNetwork id : %d.%d.%d.%d",n1,n2,n3,n4);

    if(cl=='A')

    {

    bd1=b1;

    bd2=bd3=bd4=255;

}

else if(cl=='B')

    {

    bd1=b1;

    bd2=b2;

    bd3=bd4=255;

}

else if(cl=='C')

    {

    bd1=b1;

    bd2=b2;

    bd3=b3;

    bd4=255;

}

else

{

printf("\nNo Broadcast Id");

}

printf("\nBroadcast Id : %d.%d.%d.%d",bd1,bd2,bd3,bd4);

int h;

h=log2(s);

printf("\nHost required are : %d",h);

}