C Program for Rewriting the Strings

C language is really very helpful for software developing purposes . Following Source code is of a program which will help you communicate with your friends easily that too in a secret manner . This program is used to re write the given string replacing each character with the next coming character in the alphabet series . For example , if I entered Amandeep , then it will display it as Bnboeffq .

Copy the given whole source code in your notepad and save it as with the extension *.c or *.cpp . Then open the file with your compiler and run it . You will enjoy the program for sure . It is also an exercise for the Computational Technique Subject .

#include<stdio.h>

#include<conio.h>

#include<string.h>

int main()

{

 char a[100],b[100];

 int i,len,I;

 puts("Enter you string");

 gets(a);

 len=strlen(a);

 for(i=0;i<=len;i++)

 {

    I=int(a[i]);

    I++;

    if(I==91)

    {I=65;}

    else if(I>122)

    {I=97;}

    else if(I==33)

    {I=32;}

    b[i]=char(I);

 }

printf("The output is : \n");

 for(i=0;i<len;i++)

printf("%c",b[i]);

getch();

}

For its application of secret communication , the other person must have c program which will rewrite the entered string replacing each character with its previous character which is as follows :

#include<stdio.h>

#include<conio.h>

#include<string.h>

int main()

{

 char a[100],b[100];

 int i,len,I;

 puts("Enter you string");

 gets(a);

 len=strlen(a);

 for(i=0;i<=len;i++)

 {

    I=int(a[i]);

    I--;

    if(I==96)

    {I=122;}

    else if(I==64)

    {I=90;}

    else if(I==31)

    {I=32;}

    b[i]=char(I);

 }

printf("The output is : \n");

 for(i=0;i<len;i++)

printf("%c",b[i]);

getch();

}

The screenshot is the proof of a working program .