C Language Questions Asked in Technical Interviews - Try to answer them!

Ankita
Member • Aug 22, 2011

C Language Questions Asked in Technical Interviews - Try to answer them!

I will be sharing different questions in this thread.

Its open for Engineers for all Branches.

TRY TO ANSWER THESE HERE:

1. Why don't we use multiple if statements instead of switch statement?

2. Write a C program without using Semicolon.

3. How to debug the infinite loop problem in output?

4. If we want to copy data from one file into another excluding the comments, how will you do it?

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Pensu

Member • Aug 22, 2011

2. Write a C program without using Semicolon.

#include<stdio.h>
#include<conio.h>
main()
{
clrscr();
if( printf("C program without Semi-Colon") ) {}
getch();
}

Output : C program without Semi-Colon

OR

#include<stdio.h>
#include<conio.h>
main()
{
clrscr();
while( printf("CrazyEngineers"),0 ) {}
getch();
}

Output : C program without Semi-Colon

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Ankita Katdare

Administrator • Aug 28, 2011

No more takers for the questions?

I was expecting more from programmers at CE. 😐

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Sahithi Pallavi

Member • Aug 29, 2011

1. Why don't we use multiple if statements instead of switch statement?
By using the Switch statement the user can code as many statements by using Cases and the user executes any case that he wish while running the program. We can not do this with if. May be this is the reason. Correct me if I am wrong.

3. How to debug the infinite loop problem in output?
I am used to handle infinite loops with CTRL + Pause Break. Don't know whether they are any other methods to do that without using debugger.

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Ankita Katdare

Administrator • Aug 29, 2011

Here are some more:

Why are standard library functions used?

What will happen if you do not include conio.h?

What is the difference between a string copy (strcpy) and a memory copy (memcpy)?

What is the use of preprocessor?

How can I copy just a part of a string?

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Jayesh.V

Member • Sep 1, 2011

AbraKaDabra
Here are some more:

What will happen if you do not include conio.h?

What is the difference between a string copy (strcpy) and a memory copy (memcpy)?

How can I copy just a part of a string?
1.conio.h represents the constant input and output statements, they are responsible for displaying the output in the screen they include certain basic functions like getch(); etc.

2.strcpy copies the entire string and not its address or the memory location where as the memcpy copies the memory allocation

3.substr() i guess am not sure though

correct me if i am wrong 😀

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Sahithi Pallavi

Member • Sep 1, 2011

@Akd : Please post the answers for unanswered questions!

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TheV

Member • Sep 2, 2011

I think if we use multiple ' if ' statement then it will increase the execution time of the program and also the program became lengthy.
Execution increase because it will check each and every ' if ' statement even if the first ' if ' statement is true or executed. But in "switch case", it will take
argument from the ' switch ' statement and directly jump to the specified ' case ' statement, executing only one ' case ' statement (break is given).

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TheV

Member • Sep 2, 2011

Q) Why Standard Library Function is used ?

Ans) C language provides a number of library functions which performs basic and very useful task like printing the output screen and some math function like sqrt and cos etc. If we not use these ready made functions then our program became complex and huge because if we want to calculate the square root of any number we just use the function sqrt() and not concern about what is written inside it, same with printf(). If we are not supplied with these function the coder have to write the code what is written in the printf() function which will make the program complex.

Q) What is use of preprocessor ?

Ans) From the word ' preprocessor ' it means that ' before '. That is it will take place before compilation. Before the source code passed to the compiler, the preprocessor checks for the preprocessor directives. If there are any, appropriate actions are taken, what the preprocessor defines i.e if it is #define X 10 it will replaces all X with 10, if it is #include it will include all the necessary file in the source code and the pass it to the compiler for further execution.

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Sarath sharukh

Member • Nov 3, 2016

Ankita Katdare
I will be sharing different questions in this thread.

Its open for Engineers for all Branches.

TRY TO ANSWER THESE HERE:

1. Why don't we use multiple if statements instead of switch statement?

2. Write a C program without using Semicolon.

3. How to debug the infinite loop problem in output?

4. If we want to copy data from one file into another excluding the comments, how will you do it?
1 switch case have certain cases but in if we can esyablish limits

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Sabarishraj

Member • Nov 3, 2016

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