C programming technical questions and answers with
explanation
Technical c
interview questions
1.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
int check=2;
switch (check){
case 1: printf( "D.W.Steyn" );
case 2: printf( " M.G.Johnson" );
case 3: printf( " Mohammad Asif" );
default : printf( " M.Muralidaran" );
}
}
Choose all that apply:
Explanation:
If we will not use break
keyword in each case the program control will come in each case after the case witch
satisfy the switch condition.
2.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
int movie=1;
switch (movie<<2+movie){
default :printf( "3 Idiots" );
case 4: printf( " Ghajini" );
case 5: printf( " Krrish" );
case 8: printf( " Race" );
}
}
Choose all that apply:
Explanation:
We can write case statement
in any order including the default case. That default case may be first case, last
case or in between the any case in the switch case statement.
3.
What will be output when you will execute following c code?
#include <stdio.h>
#define L 10
void main(){
auto money=10;
switch (money,money*2){
case L: printf( "Willian" );
break ;
case L*2:printf( "Warren" );
break ;
case L*3:printf( "Carlos" );
break ;
default : printf( "Lawrence" );
case L*4:printf( "Inqvar" );
break ;
}
}
Choose all that apply:
Explanation:
In c comma is also
operator which enjoy least precedence. So if
x = (a , b);
Then x = b
Note: Case expression
can be macro constant.
4.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
int const X=0;
switch (5/4/3){
case X: printf( "Clinton" );
break ;
case X+1:printf( "Gandhi" );
break ;
case X+2:printf( "Gates" );
break ;
default : printf( "Brown" );
}
}
Choose all that apply:
Explanation:
Case expression cannot
be constant variable.
5.
What will be output when you will execute following c code?
#include <stdio.h>
enum actor{
SeanPenn =5,
AlPacino =-2,
GaryOldman ,
EdNorton
};
void main(){
enum actor a=0;
switch (a){
case SeanPenn : printf( "Kevin Spacey" );
break ;
case AlPacino : printf( "Paul Giamatti" );
break ;
case GaryOldman :printf( "Donald Shuterland" );
break ;
case EdNorton : printf( "Johnny Depp" );
}
}
Choose all that apply:
Explanation:
Default value of enum
constant
GaryOldman = -2 +1 = -1
And default value of
enum constant
EdNorton = -1 + 1 = 0
Note: Case expression
can be enum constant.
6.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
switch (*(1+ "AB" "CD" +1)){
case 'A' :printf( "Pulp Fiction" );
break ;
case 'B' :printf( "12 Angry Man" );
break ;
case 'C' :printf( "Casabance" );
break ;
case 'D' :printf( "Blood Diamond" );
}
}
Choose all that apply:
Explanation:
Consider on the
expression:
*(1+"AB"
"CD"+1)
= *(2+"AB"
"CD")
= *(2+"ABCD")
=*("CD")
='C'
Note: Case expression
can be character constant.
7.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
char *str= "ONE"
str++;
switch (str){
case "ONE" :printf( "Brazil" );
break ;
case "NE" : printf( "Toy story" );
break ;
case "N" : printf( "His Girl Friday" );
break ;
case "E" : printf( "Casino Royale" );
}
}
Choose all that apply:
Explanation:
Case expression cannot
be string constant.
8.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
switch (5||2|1){
case 3&2:printf( "Anatomy of a Murder" );
break ;
case -~11:printf( "Planet of Apes" );
break ;
case 6-3<<2:printf( "The conversation" );
break ;
case 5>=5:printf( "Shaun of the Dead" );
}
}
Choose all that apply:
Explanation:
Consider on the
expression:
5||2|1
=5|| (2|1)
//Bitwise or has higher precedence
=5||3
=1
Now, value of each case
expression:
3&2 = 2
-~11 = -(-12) =12
6-3<<2 = 3
<<2 = 12
5>=5 = 1
case -~11 and case
6-3<<2 have same constant expression i.e. case 12
In c duplicate case is
not possible.
9.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
switch (6){
case 6.0f:printf( "Sangakkara" );
break ;
case 6.0: printf( "Sehwag" );
break ;
case 6.0L:printf( "Steyn" );
break ;
default : printf( "Smith" );
}
}
Choose all that apply:
Explanation:
Case expression must be
integral constant expression. If it is not integer then it is automatically
type casted into integer value.
so. (int)6.0f = 6
(int)6.0 = 6
(int)6.0L = 6
In c duplicate case is
not possible.
10.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
switch (0X0){
case NULL:printf( "Thierry Henry" );
break ;
case '\0' :printf( "Steven Gerrend" );
break ;
case 0: printf( "Kaka" );
break ;
default : printf( "Michael Ballack" );
}
}
Choose all that apply:
Explanation:
Macro constant NULL has
be defined as 0 in stdio.h
ASCII value of character
constant '\0' is 0
As we duplicate case is
not possible in c.
11.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
switch (5/2*6+3.0){
case 3:printf( "David Beckham" );
break ;
case 15:printf( "Ronaldinho" );
break ;
case 0:printf( "Lionel Messi" );
break ;
default :printf( "Ronaldo" );
}
}
Choose all that apply:
Explanation:
Consider on the
expression:
5/2*6+3.0
=2*6+3.0
=12 + 3.0
=15.0
In c switch expression
must return an integer value. It cannot be float, double or long double
12.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
unsigned char c=280;
switch (c){
printf( "Start\t" );
case 280:printf( "David Beckham\t" );
case 24: printf( "Ronaldinho\t" );
default : printf( "Ronaldo\t" );
printf( "End" );
}
}
Choose all that apply:
Explanation:
280 is beyond the range
of unsigned char. Its corresponding cyclic value is: 24
In c switch case
statement program control always move from the case which satisfy the switch
condition and end with either break keyword, terminating} or any null character
which will come first.
13.
What will be output when you will execute following c code?
#include <stdio.h>
#define TRUE 1
void main(){
switch (TRUE){
printf( "cquestionbank.blogspot.com" );
}
}
Choose all that apply:
Explanation:
In c it is possible a
switch case statement without any case but it is meaning less.
14.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
static int i;
int j=1;
int arr[5]={1,2,3,4};
switch (arr[j]){
case 1: i++; break ;
case 2: i+=2;j=3; continue ;
case 3: i%=2;j=4; continue ;
default : --i;
}
printf( "%d" ,i);
}
Choose all that apply:
Explanation:
We cannot use continue
keyword in switch case. It is part loop.
15.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
static int i;
int j;
for (j=0;j<=5;j+=2)
switch (j){
case 1: i++; break ;
case 2: i+=2;
case 4: i%=2;j=-1; continue ;
default : --i; continue ;
}
printf( "%d" ,i);
}
Choose all that apply:
Explanation:
In first iteration of
for loop:
j = 0
So, control will come to
default,
i = -1
Due to continue keyword
program control will move to beginning of for loop
In second iteration of
for loop:
j =2
So, control will come to
case 2,
i+=2
i = i+2 = -1 +2 =1
Then come to case 4,
i%=2
i = i%2 = 1%2 = 1
j= -1
Due to continue keyword
program control will move to beginning of for loop
In third iteration of
for loop:
j = -1 +2 =1
So, control will come to
case 1
i = 2
In the fourth iteration
of for loop:
j = 1+ 2 =3
So, control will come to
default,
so i = 1
In the fifth iteration
of for loop:
j = 3 + 2 =5
So, control will come to
default,
so i = 0
In the sixth iteration of
for loop:
j = 5 + 2 =7
Since loop condition is
false. So control will come out of the for loop.
16.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
int x=3;
while (1){
switch (x){
case 5/2: x+=x+++x;
case 3%4: x+=x---x; continue ;
case 3>=3: x+=!!!x; break ;
case 5&&0:x+=~~~x; continue ;
default : x+=-x--;
}
break ;
}
printf( "%d" ,x);
}
Choose all that apply:
Explanation:
Think yourself.
17.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
char *str= "cquestionbank.blogspot.com" ;
int a=2;
switch ( 'A' ){
case 97:
switch (97){
default : str+=1;
}
case 65:
switch (97){
case 'A' :str+=2;
case 'a' :str+=4;
}
default :
for (;a;a--)
str+=8;
}
printf( "%s" ,str);
}
Choose all that apply:
Explanation:
ASCII value of the
character constant 'A' is 65 and 'a' is 97
Nesting of switch case
is possible in c.
18.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
switch (2){
case 1L:printf( "No" );
case 2L:printf( "%s" , "I" );
goto Love;
case 3L:printf( "Please" );
case 4L:Love:printf( "Hi" );
}
}
Choose all that apply:
Explanation:
It is possible to write
label of goto statement in the case of switch case statement.
19.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
int a=5;
a=a>=4;
switch (2){
case 0: int a=8;
case 1: int a=10;
case 2:++a;
case 3:printf( "%d" ,a);
}
}
Choose all that apply:
Explanation:
We can not declare any
variable in any case of switch case statement.
20.
What will be output when you will execute following c code?
#include <stdio.h>
void main(){
int a=3,b=2;
a=a==b==0;
switch (1){
a=a+10;
}
sizeof (a++);
printf( "%d" ,a);
}
Choose all that apply:
Explanation:
Consider on the
expression:
a=a==b==0;
a=(a==b)==0; //Since
associate is right to left
a =(3==2)==0
a=0==0
a=1
switch case will not
affect the value of variable a.
Also sizeof operator
doesn't affect the value of the any variable
20 comments:
pls provide the solutions soon........
questions are good but needs answers for some selected ones which are tough to decode....
solution
Hi Mayank,
I will publish the solution today
can contact me for explanation doubts and solution
280 is beyond the range of unsigned char. Its corresponding cyclic value is: 24
can anyone explain cyclic value of char,integer when it crosses its range...
i can explain cyclic value of char,integer when it crosses its range... contact me on 9550891364
nice job...give us some more qs.....
till now i did't see such a kind of website for c language...... really superb....
expalnation of qus 9 is wrong..
switch do not perform type casting of its cases..I hv checked with 6.0,5.0,7.0...error occurs
nidhi is right.......!
in Q2 movie<<2+movie
what is the meaning of <<.
can we use continue in switch
write programme enter your choice some alphabate letter and findout alphabate is vowel or consonant?
using switch case
in case logical operator can't be used thats' why give compilation error but in Q 8 u give the reason : case duplicacy.
is bitwise operator will use in case.
plz explain.on my id............
sachingrover2@gmail.com
plz explain question 6 *("CD")='C'
in case logical operator can't be used thats' why give compilation error but in Q 8 u give the reason : case duplicacy.
is bitwise operator will use in case.
This question always arise i can also same doubt
ple explain these details in my email id msraman1991@yahoo.com
Good Ques
Explanation to ques no 4 is wrong ...case expression has to be a constant expression.so there wont be any error in this question.
please explain question no.6
how *(2+"ABCD")=*("CD")
='C'
Really i an unable 2 understand....
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