Classless addresing

 #include<stdio.h>

#include<math.h>

int checking(char *ip)

{

 int i=0,c=0,s=0;

 while (ip[i]!='\0')

 {

 if (ip[i]=='.')

 {

 c++;

 }

 if (ip[i]=='/')

 {

 s++;

 }

 i++;

}

 if (c==3&&s==1)

 {

 return 1;

 }

 return -1;

}

int validity(int a,int b,int c,int d,int n)

{

 if (a<=255&&b<=255&&c<=255&&d<=255&&n<=32)

 {

 return 1;

 }

 else

 {

 printf ("Check the Ip Address first");

 return -1;

 }

}

int dectobi(int n)

{

 int rem;

 rem=n%2;

 return rem;

}

int bitodec(int n,int i) 

{

return pow(2,i)*n;

}

void finding_first(int *aa,int *bb,int *cc,int *dd,int *first)

{

 int i;

 for(i=0;i<8;i++)

 {

 first[i]=aa[i]&&first[i];

 first[i+8]=bb[i]&&first[i+8];

 first[i+16]=cc[i]&&first[i+16];

 first[i+24]=dd[i]&&first[i+24];

 }

}

void finding_last(int *aa,int *bb,int *cc,int *dd,int *last)

{

 int i;

 for (i=0;i<8;i++)

 {

 last[i]=aa[i]||last[i];

 last[i+8]=bb[i]||last[i+8];

 last[i+16]=cc[i]||last[i+16];

 last[i+24]=dd[i]||last[i+24];

 }

}

void Display(int f1,int f2,int f3,int f4,int l1,int l2,int l3,int l4)

{

 int i;

 printf ("First Address is :\t%d.%d.%d.%d",f1,f2,f3,f4);

 printf ("\nLast Address is :\t%d.%d.%d.%d",l1,l2,l3,l4);

}

int main()

{

 char ip[19];

 int a,b,c,d,check,i=0,j,f1=0,f2=0,f3=0,f4=0,l1=0,l2=0,l3=0,l4=0;

 unsigned int n;

 int aa[8],bb[8],cc[8],dd[8],first[32],last[32];

 while(1)

 {

 printf ("\nAre you want to Continue : \n press \n1.Continue 0. Stop");

 scanf("%d",&i); 

 if (i==0)

 {

 printf ("Thank You");

 return 0;

 }

 for(i=0;i<8;i++)

 {

 aa[i]=0;

 bb[i]=0;

 cc[i]=0;

 dd[i]=0;

 }

 i=0;

 printf ("\n\nEnter Ip Address : \t");

 scanf ("%s",ip);

 check=checking(&ip[0]);

 if (check==-1)

 {

 printf ("\nEntered Ip Address is Wrong.");

 continue;

 }

 sscanf(ip,"%d.%d.%d.%d/%d",&a,&b,&c,&d,&n);

 for(i=0;i<32;i++)

 {

 if (i<n)

 {

 first[i]=1;

 last[i]=0;

 }

 else

 {

 first[i]=0;

 last[i]=1;

 }

}

 check=validity(a,b,c,d,n);

 if (check==-1)

 {

 printf ("\nEntered Ip Address is Wrong.");

 continue;

 }

 for(j=7;a>0||b>0||c>0||d>0;j--)

 { 

 aa[j]=dectobi(a);

 bb[j]=dectobi(b);

 cc[j]=dectobi(c);

 dd[j]=dectobi(d);

 a=a/2;

 b=b/2;

 c=c/2;

 d=d/2;

 }

 j=7;

finding_first(&aa[0],&bb[0],&cc[0],&dd[0],&first[0]);

finding_last(&aa[0],&bb[0],&cc[0],&dd[0],&last[0]);

for(i=0;i<8;i++)

{

f1=bitodec(first[i],j)+f1;

f2=bitodec(first[i+8],j)+f2;

f3=bitodec(first[i+16],j)+f3;

f4=bitodec(first[i+24],j)+f4;

l1=bitodec(last[i],j)+l1;

l2=bitodec(last[i+8],j)+l2;

l3=bitodec(last[i+16],j)+l3;

l4=bitodec(last[i+24],j)+l4;

j--;

}

Display(f1,f2,f3,f4,l1,l2,l3,l4);

n=pow(2,(32-n));

printf ("\nNumbers of Adderesses in Class is %ld",n);

}

} 

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