CSE 1071 Problem Solving using Computers

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Questions and Answers

What will be the output of the code snippet: printf(“%d ”, -a) if a = 25?

25 and -2

-25 (correct)

In the expression a + b * c, which operation is performed first?

Addition (+)

Multiplication (*) (correct)

Subtraction (-)

Division (/)

Which of the following describes the associative property in arithmetic expressions?

It determines the order of operations between different operators.

It applies only to addition and subtraction operators.

It applies to operators of the same precedence level. (correct)

It makes parentheses unnecessary in all expressions.

What does the modulo operator (%) do?

It finds the remainder of a division operation. Signup and view all the answers

If we have the expression (x + y) * z, what would be the equivalent expression without parentheses assuming standard operator precedence?

x + y * z Signup and view all the answers

What is the maximum positive value that can be represented by an unsigned char?

255 Signup and view all the answers

Which modifier can be used to store both negative and positive numbers in an integer type?

signed Signup and view all the answers

Which of the following types has the smallest range of values?

short int Signup and view all the answers

What is the size of a signed long int on a 16-bit machine?

32 bits Signup and view all the answers

Which of the following is considered an escape character?

'\t' Signup and view all the answers

What is the range of values for an unsigned int on a 16-bit machine?

0 to 65,535 Signup and view all the answers

What distinguishes a signed char from a regular char?

The range of values it can represent. Signup and view all the answers

Which type specifies that a variable can only hold positive values?

unsigned int Signup and view all the answers

What will be the result of the expression $a=(int) 21.3/(int)4.5$?

5 Signup and view all the answers

What will the expression $x=(int) 7.5$ evaluate to?

7 Signup and view all the answers

What happens when a floating-point value is assigned to an integer variable?

The integer portion is stored, and the decimal is ignored. Signup and view all the answers

How does the expression $p= cos((double)x)$ transform the variable x?

x is converted to double before the cosine function is applied. Signup and view all the answers

In the expression $(float)6 / 4$, what will be the result?

1.5 Signup and view all the answers

What will be the output of result in the first printf statement in the code?

450 Signup and view all the answers

What is the value of the expression 10 < 20?

1 Signup and view all the answers

How are expressions like a < b + c processed according to operator precedence?

It processes b + c first. Signup and view all the answers

What is the output of result in the second printf statement in the code?

600 Signup and view all the answers

What does the operator '!=' signify?

Is not equal to Signup and view all the answers

Which of the following expressions is considered a relational expression?

a + b < c + d Signup and view all the answers

In which order will the operations be processed for the expression a < b + c?

a < (b + c) Signup and view all the answers

Which of the following statements is true regarding relational operators?

They yield true or false values. Signup and view all the answers

What will be the output of the statement 'i1 = f1;' where f1 is a float with a value of 123.125?

123 Signup and view all the answers

What is the result of the operation 'i1 = i2 / 100;' if i2 is initialized to -150?

-1 Signup and view all the answers

What will 'f1 = i2 / 100.0;' yield if i2 is -150?

-1.5 Signup and view all the answers

Which assignment operator format correctly follows the precedence rules in C?

a /= (b + c) Signup and view all the answers

In the conditional operator 'condition ? expression1 : expression2', what happens if the condition evaluates to FALSE?

expression2 is executed Signup and view all the answers

What is the outcome of using 'count += 10;' in a C program?

count = count + 10 Signup and view all the answers

What type of division is performed when an integer is divided by another integer in C?

Integer division Signup and view all the answers

Study Notes

Modifiers (Type Specifiers)

short: Uses fewer bits (typically 8 bits).
long: Allocates more bits (typically 32 bits).
signed: Represents both negative and positive values.
unsigned: Represents only positive values.

Size and Range of Values for 16-bit Machine (Integer Type)

short int / signed short int:
- Size: 8 bits
- Range: -128 to 127
unsigned short int:
- Size: 8 bits
- Range: 0 to 255
int / signed int:
- Size: 16 bits
- Range: -32,768 to 32,767
unsigned int:
- Size: 16 bits
- Range: 0 to 65,535
long int / signed long int:
- Size: 32 bits
- Range: -2,147,483,648 to 2,147,483,647
unsigned long int:
- Size: 32 bits
- Range: 0 to 4,294,967,295

Character Types

char: Stores a single character (1 byte) with a range of -128 to 127.
signed char: Same range as char; -128 to 127.
unsigned char: Has a range of 0 to 255.
ASCII is the primary encoding scheme for characters.

Unary Minus Operator

Negates a value (e.g., -a makes 25 into -25).

Arithmetic Expressions

Basic operators include +, -, *, /, and %.
Operator precedence determines order of evaluation:
- High priority: *, /, %
- Low priority: +, -
Parentheses can alter precedence (e.g., a + (b * c)).
Left-to-right associativity for most operators, including +.

Relational Operators

Operators: ==, !=, <, >, <=, >=.
Lower precedence than arithmetic operators.
Relational expressions yield true (1) or false (0).
Example: 10 < 20 results in true.

Type Casting

Consists of converting one data type to another.
For example: (int) 29.55 + (int) 21.99 results in 29 + 21.

Type Conversions in Expressions

Conversions affect how values are processed:
- Truncation occurs when converting from float to int.
- Integer arithmetic produces integer results, while floating-point division results in real numbers.

Integer and Floating-Point Conversions

Assigning integers to floating variables doesn't affect the value.
Assigning floats to integers truncates the decimal.
Integer division yields an integer result, while division involving floating points yields a float.

Assignment Operators

Combine arithmetic operations with assignment (e.g., count += 10 is equivalent to count = count + 10).
Maintain operator precedence rules during assignment.

Conditional Operator

Format: condition ? expression1 : expression2.
Evaluates condition; if true, evaluates and returns expression1, otherwise returns expression2.

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Description

This quiz covers the concept of modifiers (type specifiers) in programming, specifically focusing on short, long, signed, and unsigned integer types. Understand how these modifiers affect the size and range of values in a 16-bit machine. Test your knowledge of these fundamental programming concepts.

CSE 1071 Problem Solving using Computers - Modifiers