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C Basics
course content

Contenuti del Corso

C Basics

C Basics

1. Introduction
Structure of the C-ProgramEssentials of C ProgramHow to Run the Program?
2. Data
DataVariablesPrintfIntroduction to ArraysTwo Dimensional ArraysChar and StringSizeofPrintf PracticeSizeof Practice
3. Operators
Assignment, Comparison, Not Equal ToSum, Difference, Increment, DecrementMultiplication, Division and ModuloComparison OperatorsComparison Operators PracticeLogical OperatorsLogical Operators Practice
4. Control Statements
If-else Operatorif-else Operator PracticeTernary OperatorSwitch, BreakWhile, Do-WhileFor, ContinueFor Loop Practice
5. Functions
Structure of the FunctionDeclaration, Type and ReturnArgumentsPassing ArgumentsHeader, Prototypes Void, Recursion
6. Pointers
Pointers are around UsReferences and DereferencesPointersMalloc and FreeFunctions, Arrays and Two PointersVoid

book
Assignment, Comparison, Not Equal To

We've learned how to store data in variables, organize data into arrays, and display data as strings. Yet, we haven't explored how to modify or manipulate that data.

Assignment Operator (=)

We're already familiar with this operator. It assigns the value on the right to the variable on the left:

int x = 5;  // Assigns the value 5 to variable `x`
int y = 8;  // Assigns the value 8 to variable `y`
x = y;      // Assigns the value of `y` to `x` (so now, `x` is 8)

Comparison Operators (!=, ==)

Let's delve into how these work:

int result = (50 != 2);

The expression (50 != 2) evaluates to either true (1) or false (0), depending on the validity of the comparison.

The != operator stands for "not equal".

If 50 isn't equal to 2, then (50 != 2) evaluates to true.

In computing, the notions of "true" and "false" are numerically represented as 1 (true) and 0 (false):

  • 1 represents true;
  • 0 represents false.

Note

The binary values 0 and 1 can also represent states. We've already encountered these values when discussing byte states in a previous lesson.

For instance, with the != operator:

Main.c

Main.c

copy

              
12345678910

            
#include <stdio.h>

int main()
{
	int result = (50 != 2);

	printf("%d", result);

	return 0;
}

The expression (50 != 2) evaluates to true, or 1.

The == operator checks for equality.

For instance:

Main.c

Main.c

copy

              
12345678910

            
#include <stdio.h>

int main()
{
	int result = (50 == 2);

	printf("%d", result);

	return 0;
}

The expression (50 == 2) is false, or 0, because 50 is not equal to 2.

question mark

What is the output of the next code?

Select the correct answer

Tutto è chiaro?

Come possiamo migliorarlo?

Grazie per i tuoi commenti!

Sezione 3. Capitolo 1

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course content

Contenuti del Corso

C Basics

C Basics

1. Introduction
Structure of the C-ProgramEssentials of C ProgramHow to Run the Program?
2. Data
DataVariablesPrintfIntroduction to ArraysTwo Dimensional ArraysChar and StringSizeofPrintf PracticeSizeof Practice
3. Operators
Assignment, Comparison, Not Equal ToSum, Difference, Increment, DecrementMultiplication, Division and ModuloComparison OperatorsComparison Operators PracticeLogical OperatorsLogical Operators Practice
4. Control Statements
If-else Operatorif-else Operator PracticeTernary OperatorSwitch, BreakWhile, Do-WhileFor, ContinueFor Loop Practice
5. Functions
Structure of the FunctionDeclaration, Type and ReturnArgumentsPassing ArgumentsHeader, Prototypes Void, Recursion
6. Pointers
Pointers are around UsReferences and DereferencesPointersMalloc and FreeFunctions, Arrays and Two PointersVoid

book
Assignment, Comparison, Not Equal To

We've learned how to store data in variables, organize data into arrays, and display data as strings. Yet, we haven't explored how to modify or manipulate that data.

Assignment Operator (=)

We're already familiar with this operator. It assigns the value on the right to the variable on the left:

int x = 5;  // Assigns the value 5 to variable `x`
int y = 8;  // Assigns the value 8 to variable `y`
x = y;      // Assigns the value of `y` to `x` (so now, `x` is 8)

Comparison Operators (!=, ==)

Let's delve into how these work:

int result = (50 != 2);

The expression (50 != 2) evaluates to either true (1) or false (0), depending on the validity of the comparison.

The != operator stands for "not equal".

If 50 isn't equal to 2, then (50 != 2) evaluates to true.

In computing, the notions of "true" and "false" are numerically represented as 1 (true) and 0 (false):

  • 1 represents true;
  • 0 represents false.

Note

The binary values 0 and 1 can also represent states. We've already encountered these values when discussing byte states in a previous lesson.

For instance, with the != operator:

Main.c

Main.c

copy

              
12345678910

            
#include <stdio.h>

int main()
{
	int result = (50 != 2);

	printf("%d", result);

	return 0;
}

The expression (50 != 2) evaluates to true, or 1.

The == operator checks for equality.

For instance:

Main.c

Main.c

copy

              
12345678910

            
#include <stdio.h>

int main()
{
	int result = (50 == 2);

	printf("%d", result);

	return 0;
}

The expression (50 == 2) is false, or 0, because 50 is not equal to 2.

question mark

What is the output of the next code?

Select the correct answer

Tutto è chiaro?

Come possiamo migliorarlo?

Grazie per i tuoi commenti!

Sezione 3. Capitolo 1
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