Computer-Networks/Checksum.cpp at main · Shubha-ml/Computer-Networks · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
/* Checksum */
#include<stdio.h>
#include<string.h>

int main()
{
    char a[20],b[20];
    char sum[20],complement[20];
    int i,length;

	printf("Enter first binary string\n");
    scanf("%s",&a);
    printf("Enter second binary string\n");
    scanf("%s",&b);

    if(strlen(a)==strlen(b)){
		length = strlen(a);
		char carry='0';

		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';

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

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

            }
            else
                break;
        }

		printf("\nSum=%c%s",carry,sum);

		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");
	}
}