Computer Networks Lab Assignment: Error Detection and Checksum Implementation, Assignments of Network security

Download Computer Networks Lab Assignment: Error Detection and Checksum Implementation and more Assignments Network security in PDF only on Docsity!

ITE3001-DCCN

LAB DA

Name: Utkarsh Goyal

Reg.No 19BIT

Q1. Code a C Program to test the following case, Assuming that your error detection method is following even parity, find the parity bit for each of the following data units. Code: #include <stdio.h> int main(){ int n,d,e=0; printf("Enter the binary number: "); scanf("%d",&n); while (n){ d=n%10; if (d==1){ e+=1; } n=n/10; }

• b.)
• c.)
• d.)

scanf("%s",d); if(strlen(a)==strlen(b)&&strlen(b)==strlen(c)&&strlen(c)= =strlen(d)){ length = strlen(a); char carry='0'; for (j=0;j<3;j++) { for(i=length-1;i>=0;i--) { if(a[i]=='0' && b[i]=='0' && carry=='0') { sum[i]='0'; carry='0'; } else if(a[i]=='0' && b[i]=='0' && carry=='1') { sum[i]='1'; carry='0'; }

else if(a[i]=='0' && b[i]=='1' && carry=='0') { sum[i]='1'; carry='0'; } else if(a[i]=='0' && b[i]=='1' && carry=='1') { sum[i]='0'; carry='1'; } else if(a[i]=='1' && b[i]=='0' && carry=='0') { sum[i]='1'; carry='0'; } else if(a[i]=='1' && b[i]=='0' && carry=='1') { sum[i]='0'; carry='1';

a[i]=c[i]; } for (i=0;i<length;i++){ b[i]=d[i]; } } if (j==1){ for (i=0;i<length;i++){ sumcd[i]=sum[i]; } for (i=0;i<length;i++){ a[i]=sumab[i]; } for (i=0;i<length;i++){ b[i]=sumcd[i]; } } if (j==2){

break; } } for(i=0;i<length;i++) { if(sum[i]=='0') complement[i]='1'; else complement[i]='0'; } if(carry=='1') carry='0'; else carry='1'; printf("\nChecksum=%c%s",carry,complement); }else { printf("\nWrong input strings"); } }

char sum[20], sumab[20], sumcd[20], complement[20], sum1[20], complement1[20]; int i,length,j,x,y,w,z; printf("Enter first binary number \n"); scanf("%s",a); printf("Enter second binary number \n"); scanf("%s",b); printf("Enter third binary number \n"); scanf("%s",c); printf("Enter fourth binary number \n"); scanf("%s",d); if(strlen(a)==strlen(b)&&strlen(b)==strlen(c)&&strlen(c)= =strlen(d)){ length = strlen(a); char carry='0'; for (j=0;j<3;j++) { for(i=length-1;i>=0;i--)

if(a[i]=='0' && b[i]=='0' && carry=='0') { sum[i]='0'; carry='0'; } else if(a[i]=='0' && b[i]=='0' && carry=='1') { sum[i]='1'; carry='0'; } else if(a[i]=='0' && b[i]=='1' && carry=='0') { sum[i]='1'; carry='0'; } else if(a[i]=='0' && b[i]=='1' && carry=='1') { sum[i]='0';

sum[i]='1'; carry='1'; } else break; } if (j==0){ for (i=0;i<length;i++){ sumab[i]=sum[i]; } for (i=0;i<length;i++){ a[i]=c[i]; } for (i=0;i<length;i++){ b[i]=d[i]; } } if (j==1){ for (i=0;i<length;i++){

sumcd[i]=sum[i]; } for (i=0;i<length;i++){ a[i]=sumab[i]; } for (i=0;i<length;i++){ b[i]=sumcd[i]; } } if (j==2){ break; } } for(i=0;i<length;i++) { if(sum[i]=='0') complement[i]='1'; else

else if(sum[i]=='0' && complement[i]=='1' && carry=='0') { sum1[i]='1'; carry='0'; } else if(sum[i]=='0' && complement[i]=='1' && carry=='1') { sum1[i]='0'; carry='1'; } else if(sum[i]=='1' && complement[i]=='0' && carry=='0') { sum1[i]='1'; carry='0'; } else if(sum[i]=='1' && complement[i]=='0' && carry=='1') { sum1[i]='0'; carry='1';

else if(sum[i]=='1' && complement[i]=='1' && carry=='0') { sum1[i]='0'; carry='1'; } else if(sum[i]=='1' && complement[i]=='1' && carry=='1') { sum1[i]='1'; carry='1'; } else break; } for(i=0;i<length;i++) { if(sum1[i]=='0') complement1[i]='1'; else