C Aptitude Questions and answers with explanation

C Aptitude 28
C program is one of most popular programming language which is used for core level of coding across the board. C program is used for operating systems, embedded systems, system engineering, word processors,hard ware drivers, etc.

The C aptitude questions and answers for those questions along with explanation for the interview related queries.

We hope that this questions and answers series on C program will help students and freshers who are looking for a job, and also programmers who are looking to update their aptitude on C program.
Some of the illustrated examples will be from the various companies, and IT industry experts.

Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.

–>
Predict the output or error(s) for the following:

C aptitude 28.1

 main()
{
char *p="hai friends",*p1;
p1=p;
while(*p!='') ++*p++;
printf("%s %s",p,p1);
}

Answer: ibj!gsjfoet

Explanation: ++*p++ will be parse in the given order
 *p that is value at the location currently pointed by p will be taken
  ++*p the retrieved value will be incremented
 when ; is encountered the location will be incremented that is p++ will be executed

Hence, in the while loop initial value pointed by p is ‘h’, which is changed to ‘i’ by executing ++*p and pointer moves to point, ‘a’ which is similarly changed to ‘b’ and so on. Similarly blank space is converted to ‘!’. Thus, we obtain value in p becomes “ibj!gsjfoet” and since p reaches ‘’ and p1 points to p thus p1doesnot print anything.

C aptitude 28.2

   #include <stdio.h>
#define a 10
main()
{
#define a 50
printf("%d",a);
}

Answer: 50

Explanation:The preprocessor directives can be redefined anywhere in the program. So the most recently assigned value will be taken.

C aptitude 28.3

     
main()
{
printf("%p",main);
}


Answer:Some address will be printed.
Explanation: Function names are just addresses (just like array names are addresses). main() is also a function. So the address of function main will be printed. %p in printf specifies that the argument is an address. They are printed as hexadecimal numbers.

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C Aptitude Questions and answers with explanation

C Aptitude 26
C program is one of most popular programming language which is used for core level of coding across the board. C program is used for operating systems, embedded systems, system engineering, word processors,hard ware drivers, etc.

In this site, we have discussed various type of C programs till date and from now on, we will move further by looking at the C aptitude questions.

In the coming days, we will post C aptitude questions, answers and explanation for interview preparations.

The C aptitude questions and answers for those questions along with explanation for the interview related queries.

We hope that this questions and answers series on C program will help students and freshers who are looking for a job, and also programmers who are looking to update their aptitude on C program.
Some of the illustrated examples will be from the various companies, and IT industry experts.
Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.

Predict the output or error(s) for the following:

C aptitude 26.1

 main( )
{
void *vp;
char ch = ‘g’, *cp = “goofy”;
int j = 20;
vp = &ch;
printf(“%c”, *(char *)vp);
vp = &j;
printf(“%d”,*(int *)vp);
vp = cp;
printf(“%s”,(char *)vp + 3);
}

Answer: g20fy

Explanation: Since a void pointer is used it can be type casted to any other type pointer. vp = &ch stores address of char ch and the next statement prints the value stored in vp after type casting it to the proper data type pointer. the output is ‘g’. Similarly the output from second printf is ‘20’. The third printf statement type casts it to print the string from the 4th value hence the output is ‘fy’.

C aptitude 26.2

   main ( )
{
static char *s[ ] = {“black”, “white”, “yellow”, “violet”};
char **ptr[ ] = {s+3, s+2, s+1, s}, ***p;
p = ptr;
**++p;
printf(“%s”,*--*++p + 3);
}

Answer: ck

Explanation:In this problem we have an array of char pointers pointing to start of 4 strings. Then we have ptr which is a pointer to a pointer of type char and a variable p which is a pointer to a pointer to a pointer of type char. p hold the initial value of ptr, i.e. p = s+3. The next statement increment value in p by 1 , thus now value of p = s+2. In the printf statement the expression is evaluated *++p causes gets value s+1 then the pre decrement is executed and we get s+1 – 1 = s . the indirection operator now gets the value from the array of s and adds 3 to the starting address. The string is printed starting from this position. Thus, the output is ‘ck’.

C aptitude 26.3

     
main()
{
int i, n;
char *x = “girl”;
n = strlen(x);
*x = x[n];
for(i=0; i < n; ++i)
{
printf(“%sn”,x);
x++;
}
}

Answer:
(blank space)
 irl
 rl
 l

  Explanation: Here a string (a pointer to char) is initialized with a value “girl”. The strlen function returns the length of the string, thus n has a value 4. The next statement assigns value at the nth location (‘’) to the first location. Now the string becomes “irl” . Now the printf statement prints the string after each iteration it increments it starting position. Loop starts from 0 to 4. The first time x[0] = ‘’ hence it prints nothing and pointer value is incremented. The second time it prints from x[1] i.e “irl” and the third time it prints “rl” and the last time it prints “l” and the loop terminates.

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C Aptitude Questions and answers with explanation

C Aptitude 24
C program is one of most popular programming language which is used for core level of coding across the board. C program is used for operating systems, embedded systems, system engineering, word processors,hard ware drivers, etc.

In this site, we have discussed various type of C programs till date and from now on, we will move further by looking at the C aptitude questions.

In the coming days, we will post C aptitude questions, answers and explanation for interview preparations.

The C aptitude questions and answers for those questions along with explanation for the interview related queries.

We hope that this questions and answers series on C program will help students and freshers who are looking for a job, and also programmers who are looking to update their aptitude on C program.
Some of the illustrated examples will be from the various companies, and IT industry experts.
Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.

Predict the output or error(s) for the following:

C aptitude 24.1

  main()
{
printf("%x",-1<<4);
}


Answer: fff0

Explanation: -1 is internally represented as all 1’s. When left shifted four times the least significant 4 bits are filled with 0’s.The %x format specifier specifies that the integer value be printed as a hexadecimal value.

C aptitude 24.2

   main()
{
char string[]="Hello World";
display(string);
}
void display(char *string)
{
printf("%s",string);
}

Answer: Compiler Error : Type mismatch in redeclaration of function display

Explanation:In third line, when the function display is encountered, the compiler doesn’t know anything about the function display. It assumes the arguments and return types to be integers, (which is the default type). When it sees the actual function display, the arguments and type contradicts with what it has assumed previously. Hence a compile time error occurs.

C aptitude 24.3

      main()
{
int c=- -2;
printf("c=%d",c);
}

Answer:c=2

Explanation: Here unary minus (or negation) operator is used twice. Same maths rules applies, ie. minus * minus= plus.
Note: However you cannot give like –2. Because — operator can only be applied to variables as a decrement operator (eg., i–). 2 is a constant and not a variable.

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C Aptitude Questions and answers with explanation

C Aptitude 22
C program is one of most popular programming language which is used for core level of coding across the board. C program is used for operating systems, embedded systems, system engineering, word processors,hard ware drivers, etc.

In this site, we have discussed various type of C programs till date and from now on, we will move further by looking at the C aptitude questions.

In the coming days, we will post C aptitude questions, answers and explanation for interview preparations.

The C aptitude questions and answers for those questions along with explanation for the interview related queries.

We hope that this questions and answers series on C program will help students and freshers who are looking for a job, and also programmers who are looking to update their aptitude on C program.
Some of the illustrated examples will be from the various companies, and IT industry experts.
Read more about how to prepare and write the C Aptitude Exams?
Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.

 

Predict the output or error(s) for the following:

C aptitude 22.1

int main()
{
int *ptr;
*ptr=100;
return 0;
}

Answer: No error.

Explanation: At the time of compilation ,their is a no error, but at the run time you may caught up with the error “null pointer assignment”, because variable *ptr is not initialized during the declaration..

C aptitude 22.2

 
int main()
{
int example[]={2, 3, 4, 1, 6};
printf("%u, %u, %un", example, &example[0], &example);
return 0;
}

Answer: 1200 1200 1200

Explanation: In the printf statement example, &example are returning the base address of the array, i.e 1200, and &example[0] pointing to the address of the first element of array example, i.e 1200, so answer is 1200 1200 1200.

C aptitude 22.3

     int main()
{
char str1[20] = "Hello", str2[20] = " World";
printf("%sn", strcpy(str2, strcat(str1, str2)));
return 0;
}

Answer: Hello World

Explanation: In the printf statement strcat function concatenates or appends the string str2 to string str1, so str1 contains Hello World, then strcpy function copies the value of string str1 to string str2, so output is Hello World.

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How to prepare and write the C Aptitude Exams?

In this post, we are giving the some tips on how to prepare and write the C aptitude exams.
Dear friends while you are attending an interview,these days almost all companies have the C aptitude round for the freshers, so be prepare for an interview.




Preparation for C aptitude exams:

"One important key to success is self-confidence.
An important key to self-confidence is preparation"
- Arthur Ashe.
Preparation for an interview is not an one day preparation before interview process,
So Don't wait for an interview call, be updated every day. Preparation for an interview is not an easy thing,
you should know all the details about the attending company, interview pattern, company structure, depth in concepts, and more.
Every job interview question is asked to test your skill, so be prepare for your interview.

Study the Basic concepts:
You should know the basic knowledge of the language. Read more and more c language books of
different authors,recall your study materials, and try to understand the concepts like structures, 
pointers, arrays, and etc. Don't simply read the concepts, try to under stand it, and solve the problems on it. 
Invest on good C aptitude, C language books surely these books are returns the good knowledge on C program.

Point it down

How much you are studied is not an important thing, what you really understand at the end 
of the day is important. While attending the aptitude tests be specific is very important,
for that you should memorize the things what you are studied, so while preparing just note down the important 
things or underline it or use the flash cards for memorizing.

Solve, Solve,and Solve
Solve the more and more examples available on C. Try to solve the C Aptitude questions from various books or websites, it gives the strong hands on C.
Try to solve the C online tests, it is very help full to manage the time and you can know about your capability. Depends on the score you can take the more difficult tests.


Look at the history
Format/type of test isn’t a huge surprise, so try to solve the attending company previous papers. They are not repeat the same questions, but pattern and concept are the same. By solving the previous year papers you have an idea what to except.


How to write the C Aptitude exams? 
 
“Strength of mind is exercise, not rest.” 
 - Alexander Pope 
 
Each and every interview attending is a technique or a skill, you should know about an interview techniques, 
interview questions pattern or type of interview. C aptitude round is the one which finds the real talent of your programming skill, your IQ, and how you are solving the problems in the given  time inter well.

Time is the key
In the C Aptitude test round companies are giving very less time and more questions, So don't waste the time while answering.
Read the question carefully and understand it quickly. Don't confused with questions it take more time. 
First try to solve the questions on which you are very well known concepts, 
i.e. if you are good in pointers just solve the pointers questions first, then try the other questions, it helps you to score more. 
Don't waste the time on one single question, if you didn't get it, just move forward after finishing other one's if you have a more enough time then attend that type of questions.


Be specific
Don't guess the answer just by looking at it, it surely looses your marks. Try to solve the
each and every question by paper work.
If you are really prepared and you know the concept very well you will get the answer which is in the options list.

For example:

Predict the output or error(s) for the following:



main()
{
int i=-1;
+i;
printf("i = %dnn",+i);
}

Options:a. i = 0 b. i = 1 c. i = 2 d. i = -1 if you don't know the concept of unary operators, and you are going to guessing it, by looking at the +i, you will choose b or c both are wrong. Unary + is the only dummy operator in C. Where-ever it comes you can just ignore it just because it has no effect in the expressions (hence the name dummy operator) so answer is -1. Compiler dependsSome C puzzles are really very tricky be care full while answering those questions. For example: Predict the output or error(s) for the following:

void main()

{
int x,y;
x = 5;
y = ++x * ++x;
printf("Value of x = %d and Value of y = %dn",x,y);
}

Options: a.Value of x = 6 and Value of y = 30 b.Value of x = 7 and Value of y = 42 c.Value of x = 7 and Value of y = 49 d.Compiler dependent In this question most of the compilers produce the answer c,because in any expression pre 

increment operator has a higher priority than arithmetic operator as a result value of x is increment 
is first two times then value of y is evaluated.But some  compilers may produce an entire different outputs, 
so there is a choice compiler dependent, so the answer is d. 
 
Contrary methods 
In some cases if you don't know the answer, you can find the answer by looking at the options.

Example:
Predict the output or error(s) for the following:

main()

{
int i=3;
switch(i)
{

case 1: printf("one");
break;
case 2:printf("two");
break;
case 3: printf("three");
break;
default:printf("zero");
}
}

Options: a.six b.3 c.three d.four In this question if you don't know any thing about switch statement, but by looking at the options, you can easily point out that six, 3, four are not the answers, so answer is three. Dear friends be prepare for your interviews and be confident. Don't blame your luck 

after every interview, Best of luck for your interviews
"Luck is where opportunity meets preparation". Best of luck for your interviews.
-Denzel Washington

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