Simple encryption program....

 simple Encryption program

   

  program in c language

#include<stdio.h>
#include<string.h>
void main()
{
  char string[100];
  int a,temp,count,length,key=7;
  printf("Press 1 for encryption or 2 for decryption..");
  scanf("%d",&a);
  if(a==1)
  {
    printf("Enter a text to be encrypt.....");
    scanf("%s", string);

    length = strlen(string) - 1;
    for(count = 0; count < length; count++, length--)
    {
          temp = string[count];
          string[count] = string[length];
          string[length] = temp;
    }


    length=strlen(string) - 1;
    for(int i =0;i<length;i++)
    {
     string[i]= string[i]+key;
     key++;
    }

    printf("Encrypted text is....%s\n",string);

  }
  if(a==2)
  {  printf("Enter a text to be decrypt.....");
    scanf("%s", string);
    length = strlen(string) - 1;
    length=strlen(string) - 1;
    for(int i =0;i<length;i++)
    {
  string[i]=  string[i]-key;
  key++;
    }

    for(count = 0; count < length; count++, length--)
    {
          temp = string[count];
          string[count] = string[length];
          string[length] = temp;
    }


    printf("Decrypted text is....%s\n",string);
  }
}