Kittu2001

1. HAMMING CODE
2. include<stdio.h>

void main() { int data[10]; intdataatrec[10],c,c1,c2,c3,i; printf("Enter 4 bits of data one by one\n"); scanf("%d",&data[0]); scanf("%d",&data[1]); scanf("%d",&data[2]); scanf("%d",&data[4]); //Calculation of even parity data[6]=data[0]^data[2]^data[4]; data[5]=data[0]^data[1]^data[4]; data[3]=data[0]^data[1]^data[2]; printf("\nEncoded data is\n"); for(i=0;i<7;i++) printf("%d",data[i]); printf("\n\nEnter received data bits one by one\n"); for(i=0;i<7;i++) scanf("%d",&dataatrec[i]); c1=dataatrec[6]^dataatrec[4]^dataatrec[2]^dataatrec[0]; c2=dataatrec[5]^dataatrec[4]^dataatrec[1]^dataatrec[0]; c3=dataatrec[3]^dataatrec[2]^dataatrec[1]^dataatrec[0]; c=c3*4+c2*2+c1 ; if(c==0) { printf("\nNo error while transmission of data\n"); } else { printf("\nError on position %d",c); printf("\nData sent : "); for(i=0;i<7;i++) printf("%d",data[i]); printf("\nData received : "); for(i=0;i<7;i++) printf("%d",dataatrec[i]); printf("\nCorrect message is\n"); //if errorneous bit is 0 we complement it else vice versa if(dataatrec[7-c]==0) dataatrec[7-c]=1; else dataatrec[7-c]=0; 1 for (i=0;i<7;i++) { printf("%d",dataatrec[i]); } }

1. 1. CRC
2. include<stdio.h>
3. include<string.h>
4. define N strlen(g)

char t[28],cs[28],g[]="10001000000100001"; inta,e,c; voidxor(){ for(c = 1;c < N; c++) cs[c] = (( cs[c] == g[c])?'0':'1'); } voidcrc(){ for(e=0;e<N;e++) cs[e]=t[e]; do{ if(cs[0]=='1') xor(); for(c=0;c<N-1;c++) cs[c]=cs[c+1]; cs[c]=t[e++]; }while(e<=a+N-1); } int main() { printf("\nEnter data : "); scanf("%s",t); printf("\n----------------------------------------"); printf("\nGeneratng polynomial : %s",g); a=strlen(t); for(e=a;e<a+N-1;e++) t[e]='0'; printf("\n----------------------------------------"); printf("\nModified data is : %s",t); printf("\n----------------------------------------"); crc(); printf("\n CRC checksum is : %s",cs); for(e=a;e<a+N-1;e++) t[e]=cs[e-a]; printf("\n----------------------------------------"); printf("\nFinalcodeword transmitted is : %s",t); printf("\n----------------------------------------"); printf("\nTest error detection 0(yes) 1(no)? : "); scanf("%d",&e); if(e==0) { do{ printf("\nEnter the position where error is to be inserted : "); scanf("%d",&e); }while(e==0 || e>a+N-1); 1 t[e-1]=(t[e-1]=='0')?'1':'0'; printf("\n----------------------------------------"); printf("\nErroneous data : %s\n",t); } crc(); for(e=0;(e<N-1) && (cs[e]!='1');e++); if(e<N-1) { printf("\n CRC checksum is : %s",cs); printf("\nError detected\n\n"); } else { printf("\n CRC checksum is : %s",cs); printf("\nNo error detected\n\n"); } printf("\n----------------------------------------\n"); return 0;

1. 1. socket-- server side

TCP Server /*SERVER - Create a file called hello.txt in the current directory and pass that as the file name for server */

1. include<stdio.h>
2. include<arpa/inet.h>
3. include<sys/types.h>
4. include<sys/socket.h>
5. include<netinet/in.h>
6. include<netdb.h>
7. include<stdlib.h>
8. include<string.h>
9. include<unistd.h>
10. define SERV_TCP_PORT 5035
11. define MAX 60

int i, j, tem; char buff[4096], t; FILE *f1; int main(int afg, char *argv) { int sockfd, newsockfd, clength; struct sockaddr_in serv_addr,cli_addr; char t[MAX], str[MAX]; strcpy(t,"exit"); sockfd=socket(AF_INET, SOCK_STREAM,0); serv_addr.sin_family=AF_INET; serv_addr.sin_addr.s_addr=INADDR_ANY; serv_addr.sin_port=htons(SERV_TCP_PORT); printf("\nBinded"); bind(sockfd,(struct sockaddr*)&serv_addr, sizeof(serv_addr)); printf("\nListening..."); listen(sockfd, 5); clength=sizeof(cli_addr); newsockfd=accept(sockfd,(struct sockaddr*) &cli_addr,&clength); close(sockfd); read(newsockfd, &str, MAX); printf("\nClient message\n File Name : %s\n", str); f1=fopen(str, "r"); while(fgets(buff, 4096, f1)!=NULL) { write(newsockfd, buff,MAX); printf("\n"); } fclose(f1); printf("\nFileTransferred\n"); return 0; }

1. 1. socket -- client side

TCP client //CLIENT

1. include<stdio.h>
2. include<arpa/inet.h>
3. include<sys/types.h>
4. include<sys/socket.h>
5. include<netinet/in.h>
6. include<netdb.h>
7. include<stdlib.h>
8. include<string.h>
9. include<unistd.h>
10. define SERV_TCP_PORT 5035
11. define MAX 60

int main(int arg,char*argv[]) { int sockfd,n; struct sockaddr_in serv_addr; struct hostent*server; char send[MAX],recvline[MAX],s[MAX],name[MAX]; sockfd=socket(AF_INET,SOCK_STREAM,0); serv_addr.sin_family=AF_INET; serv_addr.sin_addr.s_addr=inet_addr("127.0.0.1"); serv_addr.sin_port=htons(SERV_TCP_PORT); connect(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr)); printf("\nEnter the source file name : \n"); scanf("%s",send); write(sockfd,send,MAX); while((n=read(sockfd,recvline,MAX))!=0) { printf("%s",recvline); } close(sockfd); return 0; }