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Questions and Answers
The if statement in C programming executes if the test expression is evaluated to false.
The if statement in C programming executes if the test expression is evaluated to false.
False
The if...else statement can be used to handle multiple conditions in a C program.
The if...else statement can be used to handle multiple conditions in a C program.
True
The syntax of the if statement in C programming requires a condition inside square brackets.
The syntax of the if statement in C programming requires a condition inside square brackets.
False
The if...else ladder can execute multiple statements depending on different test expressions.
The if...else ladder can execute multiple statements depending on different test expressions.
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A nested if...else statement cannot contain another if...else statement inside it.
A nested if...else statement cannot contain another if...else statement inside it.
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The else block in an if statement is mandatory in C programming.
The else block in an if statement is mandatory in C programming.
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In a C program, all statements are executed sequentially unless interrupted by a conditional statement.
In a C program, all statements are executed sequentially unless interrupted by a conditional statement.
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The condition inside the if statement must always evaluate to a Boolean value.
The condition inside the if statement must always evaluate to a Boolean value.
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A program can use an if statement only for numerical comparisons.
A program can use an if statement only for numerical comparisons.
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The if...else statement can be used to check for single conditions only.
The if...else statement can be used to check for single conditions only.
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Study Notes
Conditional Programming Element - Lesson 4
- Conditional statements in C programming allow the program to execute different code blocks based on whether a condition is true or false.
- This process is also called decision making, and the decision-making statements are control statements.
Objectives
- Understand how conditional statements work in C programming.
- Differentiate between different conditional statements in C.
Conditional Programming in C
- In C programs, code is normally executed sequentially.
- A condition allows the flow of execution to change based on whether a condition is true or false.
if Statement
- Syntax:
if (test expression)
{
/*statements to be executed if the test expression is true*/
}
- The
test expressionis evaluated. - If the expression is true, the statements inside the
ifblock are executed. - If the expression is false, the statements inside the
ifblock are skipped.
How if Statement Works
- The
ifstatement checks thetest expressioninside the parentheses. - If the
test expressionis true, the statements within theifblock are executed. - If the
test expressionis false, the statements within theifblock are not executed.
if...else Statement
- Syntax:
if (test expression) {
/*statements to be executed if the test expression is true*/
}
else {
/*statements to be executed if the test expression is false*/
}
How if...else Statement Works
- The
ifstatement checks thetest expression. If true, the statements inside theifblock are executed; otherwise, the statements inside theelseblock are executed.
if...else Ladder
- Allows checking multiple conditions.
- Syntax:
if (test expression1)
{
// statements
}
else if (test expression2)
{
// statements
}
else if (test expression3)
{
// statements
}
else {
// statements
}
Switch Statement
- Enables executing different code blocks based on various alternatives.
- Often easier to read than multiple
if...elsestatements. - Syntax:
switch (expression) {
case constant1:
// statements break;
case constant2:
// statements break;
// ...
default:
// default statements
}
How Switch Statement Works
- The
Expressionis evaluated - It determines which of the
casestatements matches - If a
casematches, the block of code associated with thatcaseis executed until abreakstatement is encountered. - If no match is found, the
defaultblock is executed.
Examples
- Demonstrates programs to check if a number is negative, check if an integer is odd or even, create a simple calculator using conditional statements in C.
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Description
Explore the fourth lesson on conditional programming in C. Understand how conditional statements like 'if' allow for decision-making in code, changing program flow based on true or false evaluations. Differentiate between various conditional statements as you learn their syntax and applications.
