Thursday, 24 April 2014

WAP to demonstrate Checksum bit for finding error

#include<stdio.h>
#include<conio.h>
int main()
{
    int a,i,j,n,ascii[20],rem=0,var,count=0,numzeros=0,totalsum=0,p,q;
    int sum=0,x[20],z[20],code[20];
    char str[20];   
    printf("enter the word length\n");
    scanf("%d",&n);
    printf("enter the word : \t");
    for(i=0;i<=n;i++)
    {
    scanf("%c",&str[i]);
    }
     for(i=1;i<=n;i++)
    {
    j=str[i];
    ascii[i]=j;
    totalsum=totalsum+j; 
    }  
    if(totalsum>256)
    {
                   p=totalsum%256;
                   q=totalsum/256;
                   totalsum=p+q;
    }
    ascii[i]=totalsum;
    printf("----------Binary Values for entered text----------\n");
    for(i=1;i<=n+1;i++)
    {
                     var=0;
                     sum=0;
                     a=ascii[i];
                     count=0;
                     while(a>1) 
                     {                   
                     rem=a%2;
                     z[var]=rem;
                     a=a/2;
                     var++;
                     }
                     z[var]=a;
                     if(var<7)
                     {
                        numzeros=7-var;
                        for(j=0;j<numzeros;j++)
                        {
                                            var++;
                                            z[var]=0;                                       
                        }    
                     }
                     if(i!=(n+1))
                     {
                     for(j=var;j>=0;j--)
                     {
                                        printf("%d",z[j]);
                     }
                     printf("(%c)",ascii[i]);
                     }
                     else
                     {
                        
                          for(j=var;j>=0;j--)
                     {
                                        printf("%d",z[j]);
                     }
                     printf("---> (Addition of binary values)\n");
                     }                    
                     printf("\n");                
    }
    printf("Generated code is \n");
                         for(j=var;j>=0;j--)
                     {
                         if(z[j]==0)
                         code[j]=1;
                         else
                         code[j]=0;                        
                                        printf("%d",code[j]);
                     }
                     printf("\n--------------------------------------------------\n\n");
                     printf("----------In receiver side : ---------------------\n");
                      for(j=var;j>=0;j--)
                     {
                                        printf("%d",z[j]);
                     }
                     printf("---> (Addition of binary values)\n");
                     for(j=var;j>=0;j--)
                     {
                                        printf("%d",code[j]);
                     }
                     printf("---> (Generated code word)\n");
                     printf("--------------------------------------------------\n");
                     printf("11111111 ---->addition operation\n");
                     printf("after complement operation\n");
                     printf("00000000 ---->no error found\n");
    getch();

}

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