WAP to Implement Creaser Cipher Algorithm

            #include<stdio.h>

#include<conio.h>

#include<string.h>

void enc(char p[]);

void dec(char c[]);

int k;

void main()

{

                        char p[20];

                        clrscr();

                        printf("enter the plaintext:");

                        scanf("%s",&p);

                        printf("enter the key:");

                        scanf("%d",&k);

                        enc(p);

            getch();

}

void enc(char p[])

{

                        int i;

                        char c[50];

                        for(i=0;i<strlen(p);i++)

                        {

                                    c[i]=p[i]+k;

                                    if((c[i]>90 && c[i]<94)||(c[i]>122 && c[i]<126))

                                    c[i]=p[i]+k-26;

                        }

                                    c[i]=NULL;

                                    printf("encrypted message: %s",c);

                                    dec(c);

}

void dec(char c[])

{

                        int i;

                        char p[100];

                        for(i=0;i<strlen(c);i++)

                        {

                                    p[i]=c[i]-k;

                                    if((c[i]>64 && c[i]<69)||(c[i]>96 && c[i]<100))

                                    p[i]=c[i]-k+26;

                        }

                                    p[i]=NULL;

                                    printf("\n decrypted message:%s",p);

}