Playfair Key Matrix Generation:
1. Read a keyword from User
2. Validate a keyword as per specification.
3. Generate and Display Playfair Key Matrix
#include<stdio.h>
int main()
{
char arr[5][5], key[10], temp[26]="";
int i,j,flag=0, cnt=0, key_check[26]={};
printf("Enter your Keyword:");
scanf("%s",key);
//Logic to check given keyword....MONARCHY
for(i=0; i<strlen(key); i++)
{
key_check[key[i]%65]++;
}
for(i=0; i<26; i++)
{
if(key_check[i] > 1)
flag=1;
//printf("%c=%d \n",i+65, key_check[i]);
}
if(flag==1)
{
printf("Enter proper keyword...\n");
exit(0);
}
else
printf("Keyword %s is ok.\n", key);
//Logic to fill Key Matrix using keyword..
strcpy(arr,key);
//logic to initialize remaining cell of key matrix
for(i=0; i<26; i++)
{
if(key_check[i]==0)
{
temp[cnt++]=(char)key_check[i]+65+i;
//printf("%c",key_check[i]+65+i);
}
}
temp[cnt]='\0';
strcat(arr,temp);
//Logic to print Key Matrix
printf("Your Playfair Key Matrix:\n");
for(i=0; i<5; i++)
{
for(j=0; j<5; j++)
printf("%c ", arr[i][j]);
printf("\n");
}
return 0;
}
Output of the program:
Enter your Keyword:MONARCHY
Keyword MONARCHY is ok.
Your Playfair Key Matrix:
M O N A R
C H Y B D
E F G I J
K L P Q S
T U V W X
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