output decrypts

```ITEC213
Structured Programming
Eastern Mediterranean University
School of Computing and Technology
Information Technology / Computer Programming
Lab #1
2010- 2011 Spring Semester
Instructors: Cantas Ozerek
Research Assistant: Laika Karsili
Task 1: Complete the following program.
Desired Output:
(a) Write the function definition of incrementby2 according to the following main
#include &lt;stdio.h&gt;
void incrementby2(int *);
int main()
{
int num1=10,num2=20,num3;
printf(&quot;Before incerement %d &quot;, num1);
incrementby2(&amp;num1);
printf(&quot;After increment %d\n&quot;, num1) ;
}
/*Write the function definition of incrementby2 below*/
(b) Modify the function incrementby2 according to the following main
#include &lt;stdio.h&gt;
/*write the function prototype here*/
int main()
{
int num1=10,num2=20,num3;
printf(&quot;Before incerement %d, &quot;, num1);
printf(&quot;After increment %d\n&quot;,incrementby2(&amp;num1)) ;
}
/*write the function definition here */
Task 2 : Complete the following program according to the following specification

Encrypt function increases each character of the argument by 3.

Decrypt function decreases each character of the argument by 3.
Hint: You can use strlen to find the length of a string or you can check for end of string character ‘\0’.
Desired Output:
#include &lt;stdio.h&gt;
#include &lt;string.h&gt;
/*Declare function prototypes here*/
void main()
{
char passwd[6];
scanf(&quot;%s&quot;,passwd);
printf(&quot;You have entered %s\n&quot;,passwd);
encrypt(passwd);
decrypt(passwd);