# Output of C programs | Set 65 (If-Else)

• Difficulty Level : Medium
• Last Updated : 07 Sep, 2021

Prerequisite : Decision making in C
Question 1

## C

 `#include"stdio.h"``#include"stdlib.h"``void` `reverse(``int` `i)``{``    ``if` `(i > 5)``         ``exit``(0);``     ``printf``(``"%d\n"``, i);``     ``return` `reverse(i++);``}``int` `main()``{``    ``reverse(1);``}`

OPTIONS:
a)Segmenation fault
b)Compilation error
c)Print 1 Infinite time
d)Both a & c

`OUTPUT:  (d)Both a & c`

Explanation:
We call the main method again and again by 1 because we use post-increment. At certain time stack frame will full means segmentation fault occurs.
Question 2

## C

 `#include"stdio.h"``int` `main()``{``    ``if``(-1L>1UL)``        ``printf``(``"paul is crazy"``);``    ``else``        ``printf``(``"mannu is Crazy"``);``}`

OPTIONS:
a)mannu is Crazy
b)paul is crazy

`OUTPUT:  (b)paul is crazy `

Explanation:
Here ,comparison between long int and unsigned long int generally which is not possible.
Now,long int is promoted to unsigned long int whose value will be
(2^size_of_unsigned_long_int)-1.
Question 3

## C

 `#include"stdio.h"``int` `main()``{``    ``int` `i;``    ``if``(i=0,2,3)``        ``printf``(``"Geeksforgeeks "``);``    ``else``        ``printf``(``"Hello "``);``    ``printf``(``"%d\n"``,i);``}`

OPTIONS:
a)Hello 3
b)Hello 0
c)Geeksforgeeks 0
d)Geeksforgeeks 3

`OUTPUT:  (c) Geeksforgeeks 0`

Explanation: At first zero will assign in ‘i’ then comma operator returns the last value which is 3 and condition becomes true.
Question 4

## CPP

 `#include"stdio.h"``int` `main()``{``    ``int` `i;``    ``if``(i=(2,1,0))``        ``printf``(``"Geeksforgeeks "``);``    ``else``        ``printf``(``"Hello "``);``    ``printf``(``"%d\n"``,i);``}`

OPTIONS:
a)Hello 3
b)Geeksforgeeks 0
c)Hello 0
d)Geeksforgeeks 3

`OUTPUT:  (c) Hello 0`

Explanation: Priority of parenthesis bracket is greater than equal to(=) operator , So atfirst comma operator return the last value which is zero(0) and then equal to(=) operator assign 0 to ‘i’ and condition becomes false.
Question 5

## C

 `#include"stdio.h"``int` `main()``{``    ``float` `a=0.7d;``    ``if``(a<0.7)``         ``printf``(``"C"``);``        ``else``         ``printf``(``"C++"``);``    ``return` `0;``}`

OPTIONS:
a)Compilation error
b)C++
c)C

`OUTPUT:  (C)C `

Explanation:
a = 0.7 is rounded to 0.699999988
and the constant 0.7 is as 0.69999999999
so a<0.7 is true so it print “c”
but in case of 0.8
a = 0.800000011 and
constant 0.8 is 0.8000000000000000
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