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crc.c
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crc.c
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#include<stdio.h>
int main()
{
int gen[30],data[30],r[10],dn,gn,i,j,cnt,tra[30],res[30],c=0;
printf("enter how many bits \n");
scanf("%d",&dn);
printf("enter the %d data bits:",dn);
for(i=0;i<dn;i++)
{
scanf("%d",&data[i]);
}
printf("enter length of generator polynomial\n");
scanf("%d",&gn);
printf("enter the %d generator bits:",gn);
for(i=0;i<gn;i++)
{
scanf("%d",&gen[i]);
}
for(i=dn;i<(gn+dn-1);i++)
{
data[i]=0;
}
for(i=0;i<(gn+dn-1);i++)
{
printf("%d",data[i]);
}
printf("\n");
for(cnt=0;cnt<gn;cnt++)
{
r[cnt]=data[cnt];
}
while(cnt<gn+dn)
{
while(r[0]==0)
{
if(cnt==gn+dn-1)
{
break;
}
for(i=0;i<gn-1;i++)
{
r[i]=r[i+1];
}
r[gn-1]=data[cnt++];
}
if(r[0]==0)
{
break;
}
for(j=0;j<gn;j++)
{
r[j]=r[j]^gen[j];
}
}
printf("CRC bits are :");
for(i=0;i<gn;i++)
{
printf("%d",r[i]);
}
j=1;
for(i=dn;i<(gn+dn-1);i++)
{
data[i]=r[j++];
}
printf("\ntransmitting bits are:");
for(i=0;i<(dn+gn-1);i++)
{
printf("%d",data[i]);
}
//for recevier side now
printf("\n");
printf("received bits are ");
for(i=0;i<(gn+dn-1);i++)
{
scanf("%d",&res[i]);
}
for(cnt=0;cnt<gn;cnt++)
{
r[cnt]=res[cnt];
}
while(cnt<gn+dn)
{
while(r[0]==0)
{
if(cnt==gn+dn-1)
{
break;
}
for(i=0;i<gn;i++)
{
r[i]=r[i+1];
}
r[gn-1]=res[cnt++];
}
if(r[0]==0)
{
break;
}
for(j=0;j<gn;j++)
{
r[j]=r[j]^gen[j];
}
}
printf("CRC bits are :");
for(i=0;i<gn;i++)
{
printf("%d",r[i]);
}
printf("\n");
for(i=0;i<gn;i++)
{
if(r[i]==0)
{
c++;
}
}
if(c==gn)
{
printf("correct\n");
}
else
printf("incorrect\n");
}