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();

}