Basics of C Programming

Question 1

What does the term ‘imperative’ describe in programming?

Answer 1

Describes computation in terms of statements that change a program state.

Question 2

What is the opposite of imperative programming?

Answer 2

Declarative programming.

Question 3

What are the two main programming paradigms associated with C?

Answer 3

• Procedural
• Functional

Question 4

Is C a compiled or interpreted language?

Answer 4

Compiled.

Question 5

What type of typing does C use?

Answer 5

Statically, weakly typed.

Question 6

What does it mean for C to be statically typed?

Answer 6

Types are checked before runtime.

Question 7

What does weakly typed mean in the context of C?

Answer 7

Supports implicit type conversions.

Question 8

On what platforms is C available?

Answer 8

Pretty much every platform.

Question 9

What is a key characteristic of C regarding portability?

Answer 9

Very fast.

Question 10

What feature does C provide for memory management?

Answer 10

Explicit memory management.

Question 11

What standards does C adhere to?

Answer 11

ANSI/ISO standards.

Question 12

True or False: C has runtime error checking.

Answer 12

False.

Question 13

What type of error handling is lacking in C?

Answer 13

Sophisticated exception handling.

Question 14

What does GNU stand for?

Answer 14

GNU stands for ‘GNU’s Not Unix’.

Question 15

What types of software packages does the GNU system include?

Answer 15

• Compilers
• Libraries
• Tools

Question 16

What is GCC?

Answer 16

GNU Compiler Collection, a compiler for multiple languages (C, C++, Java, etc.).

Question 17

What command is used to compile a C program with GCC?

Answer 17

gcc myProgram.c

Question 18

What is the default name of the executable file created by GCC?

Answer 18

a.out

Question 19

How can you run the compiled program in Linux?

Answer 19

./a.out

Question 20

How can you specify a custom output file name when compiling with GCC?

Answer 20

Use -o: e.g., gcc myProgram.c -o myProgram

Question 21

What is the purpose of compiling to an object file?

Answer 21

Object files are portable and allow linking without source code.

Question 22

What command is used to compile a C program into an object file?

Answer 22

gcc -c myProgram.c -o myProgram.o

Question 23

What command is used to link an object file and create an executable?

Answer 23

gcc myProgram.o -o myProgram

Question 24

Command to compile multiple source files at once?

Answer 24

gcc circle.c radius.c -o circle -lm

Question 25

What does the -lm option do when compiling?

Answer 25

Links the math library.

Question 26

First step in compiling multiple files separately before linking?

Answer 26

Compile each file separately with gcc -c.

Question 27

Command to link object files after separate compilation?

Answer 27

gcc circle.o radius.o -o circle -lm

Question 28

How to solve the 'sqrt not defined' error?

Answer 28

Link the math library using -lm.

Question 29

How to solve the error 'radius.o not found'?

Answer 29

Ensure all .o files are correctly compiled.

Question 30

What does K&R C refer to?

Answer 30

Original C version by Kernighan & Ritchie.

Question 31

What is ANSI C?

Answer 31

The first standardized C version (C89/C90).

Question 32

Which C version was introduced in 1999?

Answer 32

C99.

Question 33

What is the latest update of C as of 2011?

Answer 33

C11.

Question 34

What is Embedded C?

Answer 34

Version for small systems/microcontrollers.

Question 35

What integer value indicates success in C programs?

Answer 35

0.

Question 36

What integer value indicates failure/error in C?

Answer 36

Any other number.

Question 37

When a C program finishes, it returns an integer to what?

Answer 37

The operating system.

Question 38

Example of return statement indicating success?

Answer 38

return 0;

Question 39

What does 'weakly typed' mean in C?

Answer 39

Allows implicit type conversions, leading to potential issues.

Question 40

Potential issue converting larger types to smaller types in C?

Answer 40

Data loss.