Program Control Selection

Program Control Selection

Selection 

Selection is one or more statement(s) that give one or more condition(s) and the statement(s) will be executed.
There are 3 operations in selection :
1. If
2. If - Else
3. Switch Case

• If

The syntax is : 

if (boolean expression)

{

       statement(s);

}

if the boolean expression is TRUE, the statement(s) inside will be executed.

Example (a program to print i):

#include <stdio.h>

int main ()
{    

    int i;   
    i = 5; 

    if (i == 5)

   {          

       printf("%d\n", i);    

    }   

  

   return 0;

}

• If - Else

The syntax is :

if (boolean expression)

{

       statement(s);

}

else
{
       statement(s);
}

Example (a program to print i):

#include <stdio.h>

int main ()
{    
    int i;    
     i =5;

    if(i == 5)

    {          
       printf("i is %d.\n", i);
    }

    else

    {

          printf("i is not %d.\n", i);

     }    

   return 0;
}

Nested-If

The syntax is :

if (boolean expression)

{

       statement(s);
       if (boolean expression)
      {
             statement(s);
       }
       else
       {
              if (boolean expression)
              {
                     statement(s);
               }
         }
}

• Switch Case

The syntax is :

switch (expression)
{

     case (constant1) : statement(s);
                                  break;
     case (constant2) : statement(s);

                                  break;
     default : statement(s);

}

Princess Jesslyn Lorenza
2201750036

binus.ac.id

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