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COLUMNAR.CPP
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COLUMNAR.CPP
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#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<ctype.h>
void main()
{
char k[20]={'10'},pt[30]={'10'},key[30]={'10'},mat[10][10]={'10'},ct[30]={'10'};
int i=0,j=0,no[10]={0},ctr,z,a=0;
clrscr();
printf("Enter the Plaintext : ");
gets(pt);
printf("Enter the Key : ");
gets(k);
strcpy(key,k);
strcat(k,pt);
strcpy(pt,k);
printf("Enter the Ordering from 0 to the (keylength-1) : \n");
for(i=0;i<strlen(key);i++)
{
scanf("%d",&no[i]);
}
j=0;
ctr=j;
printf("The Matrix : \n");
for(i=0;i<strlen(pt);i++)
{
for(j=j;ctr<strlen(key);j++)
{
if(pt[j]!='\0')
{
mat[i][ctr]=pt[j];
printf("%c",mat[i][ctr]);
ctr++;
}
else
{
goto out;
}
}
ctr=0;
if(i==0)
{
printf("\n");
}
printf("\n");
}
out:
printf("\n\n The Encrypted Text : \n");
for(i=0;i<strlen(key);i++)
{
for(j=0;j<strlen(key);j++)
{
if(no[i]==j)
{
for(z=1;z<10;z++)
{
if(isalpha(mat[z][j]))
{
printf("%c",mat[z][j]);
ct[a]=mat[z][j];
a++;
}
}
}
}
}
getch();
}