C Language Tutorial on Nested IF Else for Beginners Session - 5 Video Lecture | Basics of C Language - Fundamentals of Programming - Software Development

today we will take up the fifth session
in which we have nested if-else nested
if-else statement when we have an
if-else condition and one more if or
else we call it as nester difference as
you can see here in an if condition we
have another if condition likewise in an
else condition we have one more as efore
else condition so such a thing is called
as nested if-else for example hash
include a stereo dot h main function and
this consider we have three variables
say comma B comma C I'll scan for them
comma
I'm sandy a comma I'm son B comma
ampersand C now if a is greater than B
then I enter into it and check again if
a is greater than C if this is true then
say printf a is big else root of C is
big if else else
if a is greater than B you'll come to
else block and say B greater than C
printf B is big else printf C is thick
execute the program that the values for
a b c p 1 2 & 3 as you can say C is big
that is 3 is big now consider your
inputs are 1 3 & 2 so it should be B is
big now if your inputs are 3 2 & 1
a speak so well in an if block I have
one more if/else block so this is called
as nested if-else blocks and in another
else block I have one more offense so
when I have an if condition or else in
one more if or else we call it as if
else block going for three variables for
variables when we have four variables
now we need to find out which is a
biggest among the four so I need to take
up four inputs from the user
let the forward variables be a comma B
comma C comma D and say for users prompt
enter four values newline character
scanners % e % e % Ian's % D comma sandy
gamma I'm sent B comma C comma I'm sandy
now say if a is greater than B then
enter and say a is greater than C and
again enter and finally say a is greater
than D now print is big else print F B
is big now come to else block and say if
C is greater than C is greater than D
and say print F C is big if not say else
printf printf D is big okay now one more
else block else get into this and say if
B greater than C and also if B greater
than D then say printf B is big f not
else print F D is big else say if C
greater than D rent
see is pick else friend F D is big
execute the program now I'm supposed to
enter four values let this be one two
three and four so D is big compile the
program once again now take up the
inputs as 1 2 4 & 3 so it should be C is
big compile the program once again now
say 1 4 2 & 3 so it should be B is big
finally if your input values are 4 3 2 &
1
a it should be is big so in this way by
using and if-else condition in one more
reference condition which we call as
nested if-else we can find out the
biggest among the 4 or even going for 5
inputs as well we'll do the same program
in another way by using logical and
operator hash include stdio.h same main
and take a we'll go for 3 variables say
greater a B and C scanf person D person
D and person D that is for ampersand a
comma ampersand B comma ampersand C now
say if a is greater than B and also a is
greater than C then we can directly say
printf is big if not come to else block
and say if B is greater than C then we
can directly print B is big if not come
to us and say printf C is big
so compile the program
I'll let the values be one two and three
so C is be taking up when puts like one
three and two its B is big going for the
inputs like three two and one it is is B
so here to find out the biggest amount
three given numbers we can go for using
logical operators or even you can
directly go for using the symbol if else
are necessary fills Block in which we
have and if condition and if-else
condition in one more if condition or
another else block we will go for
finding the biggest among four digits by
using the logical and operator a main
function in which I say integer a comma
B comma C comma D four numbers am i
accepting from the user percent e % e %
Ian percent D for for integers comma
ampersand a absent be absent see an
ampersand D now with this I can accept
four values using for the prompting to
user and four numbers now say if a
greater than B and a greater than C and
a greater than D then we can directly
say printf is big if come to else block
and say if a greater than B B greater
than C and B greater than D then we can
say printf B is big
else say if C greater than D printers C
is big else else printf D is big so even
this program works to give the biggest
amount four digits 1 2 3 & 4 so D is big
now modify the values 1 2 4 & 3 so it
should be C is big now again let the
inputs be 1 4 2 & 3 it should be B is
big now finally give the values 4 3 2 &
1
so it should be is big so either way
either of the ways we can take up the
programming style or logic to print the
biggest among four numbers one thing is
going for the logical operators like +
operator logical and and the other is
going for the nested if-else conditions
next thing is switch case construct in a
main function I'll take up an integer a
and I'll scan it personally
come ampersand a I'm scanning for value
an integer a now I'll switch switch to a
to that particular case which takes over
and close brace now here I'm supposed to
write all the cases let it be case 1 if
it is case 1 then I need to use printf
at do something like 1 and put a break
if it is case 2 printf to put a break
case 3 and say a printf 3 put a break
likewise case for printf for and put a
break so there can be any number of
cases and finally default and say printf
in out of the range because this is the
last one break is not necessary and say
now based on the value what I say 1 I
will be printing 1 if I say - I will be
printing 2 - if I say 3l be printing 3
if I say for I will be printing for on
the screen likewise up to 4 cases have
given if I say 5 5 which is not given as
a case I will be printing out of the
range so what all I didn't mention in
cases will come under D
fault option the next concept
we'll go for is the break statement here
it is used to keep skip from the current
loop this is mostly used in switch case
called multi wave branching now here in
this we are scanning for a variable and
we are switching to that particular
variable if a holds one will to jump
that particular case and break is to
break up this particular loop now if
your case is too like if your input
given is to which you'll slow written a
you'll come to case two again finally
doing that particular execution case 3
if your value given is three integer
you'll come to to this block 3 and then
doing that particular blog you'll break
it
likewise for 4 but if your value given
is out of the block he'll be printing
out of the range because it falls under
default now coming back to the if-else
statements especially when it comes to
finding the biggest among 5 biggest
among 4 will go for using 5 values
integer a comma B comma C and D comma E
so I'll be scanning printf enter 5
values a newline character scanf person
d for a
scanf person d4 b scanf person d4c scanf
person d 4 d i'm sandy and finally scanf
person d 4e i'll be scanning for all the
5 variables now I check if a is greater
than B now enter into if block if a is
greater than C enter into this F block
if a is greater than T enter into this F
block if a is greater than e here we can
say printf is big if not comes to us
block and say printf is big close this
particular if block and write an else
block for this if which happens to be if
D greater than e Prentiss D is big else
we can print he is big and close this
particular else block so now we need to
write another if block over here which
else block over here which happens to be
else if C C greater than C greater than
D enter into it and say if D greater
than E and say we can print D is big
else we can print E is big
here we'll be checking one and the each
other and each condition with all the
variables one after the other we can
close this F block come to else for this
one if D greater than e then we can say
printf D is big and sales printf he is
big come to one more if block as block
for that particular if braces closed now
another if block else block for this one
close it and say else open which was a
greater than B so we need to say else if
B greater than B greater than C enter
into the block and say if C greater than
D enter into the block and say if D
greater than e now we can say apprentice
he is big and say else printf he is big
and sales
if D greater than e say Prentice D is
big or L say
Prentiss is big again B greater than C
so else block for it and which will be
saying B greater than C B greater than C
so we'll be saying C greater than if C
greater than D and if D greater than E
say printf D is big and say printf E is
big so the program happens to be a
greater than B B greater than C and C
greater than so finally we'll be
comparing each and every variable or
input over here
if a is greater than E will say a is big
if not he is big will compel D greater
than E and we say D is big R is bits
after that you'll compare C greater than
e C greater than D a greater than E and
you say D and E after that you say C D
and D after that you say B C D and E
after that you say B C D and E finally
we'll we'll be comparing all the
conditions over here and when we
ultimately when we say
alas default condition in which we
define D greater than e the final
condition so now when I execute this
program asking for Phi in puts let it be
one two three four and five as it says
five is biggest so is big again
executing this I will be getting one two
three this time
five and four so it should be D is big
and now well just be one two five four
and three so it this time it should be C
is big and my inputs one two three five
and four so now it should be DS big and
again five four three two and one now
finally a should be is big so in this
way we can go for finding the biggest
among five numbers or even more than any
numbers using single if conditional
statements or we can even go for logical
ampersand in this way five variables can
f % a person D and B and C and D and E
so we'll get five variables will say if
a greater than B and a greater than C
and a greater than D and a greater than
e we can say printf is big else
say if a greater than B greater than C
and B greater than D and B greater than
e then we can say printf B is big come
to us block and say if C greater than D
and C greater than e then we can decide
C is the pig else say if D greater than
e then we can decide D is big if not
print F is big accept the values just a
second that the values B 1 2 3 4 and 4
he is big and now the values B 1 2 4 and
3 a greater than C and a greater than e
ABCD and E the values are 1 2 3 4 and 5
he is big again the values B 1 2 3 5 and
4 D is big values B 1 2 5 3 & 4 C is big
again the values being 1 2 5 3 & 4 C is
big so likewise 5 4 3 2 & 1
is begin this way we can get the biggest
or even the smallest if we change the
symbol we can get this
most of each and every number