Lesson 2 Flashcards
(32 cards)
1
Q
What is computer programming?
A
- Computer programming, often called coding, is the process of writing, testing, debugging, and maintaining the source code of computer programs.
2
Q
What is a computer program?
A
- A computer program, also known as a software program, is a structured collection of instructions for the computer.
3
Q
Who is a computer programmer?
A
- A computer programmer is a professional or individual who writes programs.
4
Q
Who developed the C programming language and when?
A
- C was developed in 1972 by Dennis Ritchie at Bell Telephone Laboratories.
5
Q
What was the original purpose of the C language?
A
- C was designed to implement the UNIX operating system and write system software that is architecturally independent.
6
Q
Which programming languages were influenced by C?
A
- C greatly influenced C++, which began as an extension of C, as well as Java, which borrows C’s lexical conventions and operators.
7
Q
Why is C considered versatile across different platforms?
A
- C is widely used on many software platforms, and there are few computer architectures that do not have a C compiler.
8
Q
What are the main data types in C?
A
- The main data types are:
-
char: used to hold characters. -
float: used to hold real numbers (32-bit). -
double: used to hold real numbers (64-bit). -
void: represents no value. -
int: used for whole numbers.
-
9
Q
What are keywords in C?
A
- Keywords are reserved words that have special meaning in the C language, such as
auto,break,double,int, andcase.
10
Q
What are identifiers in C?
A
- Identifiers are composed of a sequence of letters, digits, and underscores (_), typically between 8 and 15 characters long.
11
Q
What are variables in C?
A
- Variables are identifiers that store changeable values.
12
Q
What are the rules for defining variables in C?
A
- A variable must consist of letters, digits, and underscores.
- It should not begin with a digit.
- It cannot redefine an identifier from the C standard library.
- It is case-sensitive (uppercase and lowercase are different).
- Embedded blanks are not allowed.
- C language keywords cannot be used as variable names.
13
Q
What must be done before using variables in a C program?
A
- All variables must be declared before they are used.
14
Q
What are local variables in C?
A
- Local variables are declared inside a function and are only accessible within that function.Example:
c #include <stdio.h> int main() { int a, b, c; // local variables }
15
Q
What are global variables in C?
A
- Global variables are declared outside any function and are accessible to all functions within the program.Example:
c #include <stdio.h> int a, b, c; // global variables int main() { }
16
Q
What are constants in C?
A
- Constants are identifiers or variables that store values that cannot be changed during program execution.
17
Q
What is an operator in C?
A
- An operator is a symbol that tells the compiler to perform specific mathematical or logical manipulations.
18
Q
What are examples of arithmetic operators in C?
A
- Arithmetic operators include
+,-,*,/,++, and--.
19
Q
What are examples of relational operators in C?
A
- Relational operators include
>,<,<=,>=,==, and!=.
20
Q
What are examples of logical operators in C?
A
- Logical operators include
&&(AND) and||(OR).
21
Q
What are examples of logical operators in C?
A
- Logical operators include
&&(AND) and||(OR).
22
Q
What is the purpose of the \n symbol in C?
A
- The
\nsymbol is a newline character used to move the cursor to the next line.
23
Q
When do we use single quotes ' ' in C?
A
- Single quotes are used to represent a single character or letter.
24
Q
What are double quotes " used for in C?
A
- Double quotes are used to represent two or more characters, typically for strings.
25
**What does the open curly brace `{` signify in C?**
- The open curly brace `{` signifies the beginning of a block of code.
26
**What does the close curly brace `}` signify in C?**
- The close curly brace `}` signifies the end of a block of code.
27
**What is the purpose of the address operator `&` in C?**
- The address operator `&` is used to get the memory address of a variable.
28
**What is the `#include` directive in a C program?**
- The `#include` directive contains information needed by the program to ensure the correct operation of C standard library functions.
29
**What is the purpose of the `#define` directive?**
- The `#define` directive is used to shorten keywords or define constants in the program.
30
**What is the variable declaration section?**
- The variable declaration section is where you declare your variables before using them in the program.
31
**How does the body of a C program start?**
- The body of the program starts with the `main()` function, followed by `{` and `}` braces. All program statements are written inside these braces.
32
**Where should all statements be written in a C program?**
- All statements should be written inside the `{` and `}` braces of the `main()` function.
