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columnar.c
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columnar.c
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#include<stdio.h>
#include<string.h>
void main()
{
char input[50],cipherText[50];
char matrix[17][3],decrypt[17][3];
int length,i=0,j=0,k=0,rows,adjustment;
printf("Enter the plain text ");
gets(input);
length=strlen(input);
rows= length/3;
if(length%3!=0)
{
rows++;
}
while(k<length)
{
matrix[i][j++%3]=input[k];
if(j%3==0)
i++;
k++;
}
if(length%3 == 1)
{
matrix[rows-1][1]='X';
matrix[rows-1][2]='X';
}
else if(length%3 == 2)
matrix[rows-1][2]='X';
printf("Before Enc \n");
for(i=0;i<rows;i++)
{
for(j=0;j<3;j++)
{
printf("%c\t",matrix[i][j] );
}
printf("\n");
}
printf("\n");
printf("The cipher text is:\n");
k=0;
for(i=0;i<3;i++)
{
for(j=0;j<rows;j++)
{
cipherText[k++]=matrix[j][i];
}
}
for(i=0;i<length;i++)
{
if(cipherText[i]!='X')
printf("%c", cipherText[i]);
}
printf("\n");
printf("\n");
k=0;
i=0;
j=0;
if(length % 3 != 0)
adjustment = (length + (3- (length%3) ) );
else
adjustment = length;
while( k < adjustment )
{
decrypt[i++%rows][j]=cipherText[k];
if(i%rows==0)
{
j++;
}
k++;
}
printf("After dec \n");
for(i=0;i<rows;i++)
{
for(j=0;j<3;j++)
{
printf("%c\t",decrypt[i][j] );
}
printf("\n");
}
printf("\n");
k=0;
printf("The decrypted text is \n");
for(i=0;i<rows;i++)
{
for(j=0;j<3;j++)
{
if(decrypt[i][j]!='X')
printf("%c",decrypt[i][j]);
}
}
printf("\n \n");
}