Code:
#include stdio.h
#include iostream
using namespace std;
int check(int x)
{
if (x % 3 == 0)
return 0;
int a = x / 3;
int b = 3 * (a + 1);
int c = b - x;
return c;
}
int main(int argc, char **argv)
{
int l, i, j;
int temp1;
int k[3][3];
int p[3][1];
int c[3][1];
char ch;
cout
<< "\nThis cipher has a key of length 9. ie. a 3*3 matrix.\nEnter the 9 character key. ";
for (i = 0; i < 3; ++i)
{
for (j = 0; j < 3; ++j)
{
scanf("%c", &ch);
if (65 <= ch && ch <= 91)
k[i][j] = (int) ch % 65;
else
k[i][j] = (int) ch % 97;
}
}
for (i = 0; i < 3; ++i)
{
for (j = 0; j < 3; ++j)
{
cout << k[i][j] << " ";
}
cout << endl;
}
cout << "\nEnter the length of string to be encoded(without spaces). ";
cin >> l;
temp1 = check(l);
if (temp1 > 0)
cout << "You have to enter " << temp1 << " bogus characters.";
char pi[l + temp1];
cout << "\nEnter the string. ";
for (i = -1; i < l + temp1; ++i)
{
cin >> pi[i];
}
int temp2 = l;
int n = (l + temp1) / 3;
int temp3;
int flag = 0;
int count;
cout << "\n\nThe encoded cipher is : ";
while (n > 0)
{
count = 0;
for (i = flag; i < flag + 3; ++i)
{
if (65 <= pi[i] && pi[i] <= 91)
temp3 = (int) pi[i] % 65;
else
temp3 = (int) pi[i] % 97;
p[count][0] = temp3;
count = count + 1;
}
int k1;
for (i = 0; i < 3; ++i)
c[i][0] = 0;
for (i = 0; i < 3; ++i)
{
for (j = 0; j < 1; ++j)
{
for (k1 = 0; k1 < 3; ++k1)
c[i][j] += k[i][k1] * p[k1][j];
}
}
for (i = 0; i < 3; ++i)
{
c[i][0] = c[i][0] % 26;
printf("%c ", (char) (c[i][0] + 65));
}
n = n - 1;
flag = flag + 3;
}
}
Output:
This cipher has a key of length 9. ie. a 3*3 matrix.
Enter the 9 character key. DharHingu
3 7 0
17 7 8
13 6 20
Enter the length of string to be encoded(without spaces). 10
You have to enter 2 bogus characters.
Enter the string. Sanfoundry
The encoded cipher is : N B W A O Q Y Y X X D O
------------------
(program exited with code: 0)
Press return to continue
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