[c] le code
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- #include<stdio.h>
- #include<string.h>
- #define N strlen(gen_poly)
- char data[28];
- char check_value[28];
- char gen_poly[10];
- int data_length,i,j;
- void XOR(){
- for(j = 1;j < N; j++)
- check_value[j] = (( check_value[j] == gen_poly[j])?'0':'1');
- }
- void receiver(){
- printf("Enter the received data: ");
- scanf("%s", data);
- printf("\n-----------------------------\n");
- printf("Data received: %s", data);
- crc();
- for(i=0;(i<N-1) && (check_value[i]!='1');i++);
- if(i<N-1)
- printf("\nError detected\n\n");
- else
- printf("\nNo error detected\n\n");
- }
- void crc(){
- for(i=0;i<N;i++)
- check_value[i]=data[i];
- do{
- if(check_value[0]=='1')
- XOR();
- for(j=0;j<N-1;j++)
- check_value[j]=check_value[j+1];
- check_value[j]=data[i++];
- }while(i<=data_length+N-1);
- }
- int main()
- {
- printf("\nEnter data to be transmitted: ");
- scanf("%s",data);
- printf("\n Enter the Generating polynomial: ");
- scanf("%s",gen_poly);
- data_length=strlen(data);
- for(i=data_length;i<data_length+N-1;i++)
- data[i]='0';
- printf("\n----------------------------------------");
- printf("\n Data padded with n-1 zeros : %s",data);
- printf("\n----------------------------------------");
- crc();
- printf("\nCRC or Check value is : %s",check_value);
- for(i=data_length;i<data_length+N-1;i++)
- data[i]=check_value[i-data_length];
- printf("\n----------------------------------------");
- printf("\n Final data to be sent : %s",data);
- printf("\n----------------------------------------\n");
- receiver();
- return 0;
- }
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