C program of Data Communication Lab

-------------------
Hamming Code:
-------------------
#include<stdio.h>

void main()
{
    int data[10];
    int dataatrec[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 errorness bit is 0 we complement it else vice versa
        if(dataatrec[7-c]==0)
            dataatrec[7-c]=1;
        else
            dataatrec[7-c]=0;

        for (i=0; i<7; i++)
        {
            printf("%d",dataatrec[i]);
        }
    }
}






--------------------------------------
Parity Bit to Single Error detection:
--------------------------------------

#include<stdio.h>

void main()
{
    int data[5], parity_bit,n,i,count=0;
    printf("Number of Data Bit: ");
    scanf("%d",&n);
    for(i=0; i<n; i++)
    {
        printf("Enter number %d: ", i+1);
        scanf("%d",& data[i]);
    };
    printf("Enter the parity bit: ");
    scanf("%d",&parity_bit);

    data[n]=parity_bit;
    printf("Code Word: ");
    for(i=0; i<=n; i++)
    {
        printf("%d ", data[i]);
    };
    printf("\n");

    for(i=0; i<=n; i++)
    {
        if (data[i]==1)
        {
            count++;
        }
    };
    printf("Number of 1 in Data Bit: %d \n",count);

    if(count%2==0)
    {
        printf("Result: No Error!");
    }
    else
    {
        printf("Result: Error!");
    }

}