Conditionl Logic & Operator:
Conditionl
Logic used to write a program.It is most important in C programming. Conditionl
Logic is used by some operators.
- Such as,Arithmetic operator.Five arithmetic operator are used in C.They are :
+ ⟶Addition
- ⟶Subtraction
* ⟶Multiplication
/ ⟶Division
%⟶Remainder after
integer division
For example in C,
#include<stdio.h>
int main( )
{
int a=20,b=5,c;
c=a+b;
printf("%d",c);
}
The output of this program is 25
Other arithmetic operators are work in same ways.
- Another operator is Unary operator.There are two other commonly used unary operators.The increment(++) operator & the decrement (--) operator.Increment means ,value increased by 1.Decrement means, value decreased by 1.
For example,
#include<stdio.h>
int main( )
{
int a=20;
a++;
printf("%d",a);
}
a++ means,
a=a+1
so the output is 21
And a--
means,
a=a-1
- Another operator is Relational operator ,which is used in conditional logic.There are 6 relational operator in C.They are,
Operator Meaning
> greater than
>= greater than
or equal to
< less than
<= less than or
equal to
== equal to
!= not equal
to
For example,
#include<stdio.h>
int main( )
{
int a=20,b=5;
if(a>=b)
{
printf("True");
}
else
{
Printf("False");
}
}
The
output is True
Because
a=20 which is greater than b=5
The
condition of if(a>=b) is true.So compiler check the statement in if condition and print this statement.And compiler
check else condition when if condition is false….
- Another is Assignment operator.Which is,
Identifier = expression
Identifier means variable & expression means constant/value.
Such
as,
a=3
b=c
sum=a+b
These
are assignment operator.Here 3 assigned to the variable a, c assigned to b and
so on..
Remember
that, assignment(=) and equality(==)
operator are distinctly different.Assignment operator means assign value
but equality operator means the same value between two expressions.
- If ,else condition are used in conditional logic.Wherever if condition is true then this program print statement of if.Otherwise print statement of else. We can clear this by following program:
In this
code, if a=20,b=10 then (20>10) which is true.And compiler check the if statement.Store c=20+10=30 .Print
30
But when input a=10,b=20 then (10>20) which is false .And compiler check else statement .Then print 10
