BCA LECTURE-3 C PROGRAMMING

Swap using third variable

a,bàinput       a=6  b=5

t=a;                     t=6

a=b;                    a=5

b=t;                     b=6

a,bàoutput

Swap without using third variable

a,bàinput       a=3 b=8   

a=a+b;               a=11

b=a-b;                b=11-8=> b=3

a=a-b;                a=11-3=> a=8 

Decision Control Structures

Simple if

If (condition)

{

 //PROCESSING STATEMENTS

}

Condition: true / false

Conditional operator or relational operator

>        <      >=       <=            !=      ==

e.g1

a=8, b=5

a>b  t                

a<b  f

a>=b t      

          a!=b t       

         a==b f

e.g2

          a=40          b=40

          a>b  f

          a<b   f

          a==b t

          a!=b  f

          a>=b t

          a<=b t      

if else

if (condition)

{

//PROCESSING STATEMENTS

}

else

{

//PROCESSING STATEMENTS

}

Take any Number & Find which number is +ve or -ve.

nàinput

n>0 printf(“positive number”) else printf(“negative”)