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C Basics
course content

Course Content

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

bookComparison Operators

Understanding Comparison Operators

Comparison operators let you evaluate and compare values. One of the trickier aspects of these operators is remembering the correct order or arrangement of the symbols, like determining whether < or = should come first.

Below is a table of commonly used comparison operators:

OperationSymbolUsage Example
Equality==a == b
Inequality!=a != b
Greater than>a > b
Less than<a < b
Greater than or equal to>=a >= b
Less than or equal to<=a <= b

When these operators are used in a program, the outcome will be either true or false. In the context of programming, true is typically represented as 1, and false is represented as 0.

c

Main

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#include <stdio.h>

int main()
{
	printf("Expression 8 == 7 + 1 is %d\n", 8 == 7 + 1); 
	printf("Expression 10 != 3 is %d\n", 10 != 3);
	printf("Expression 7 > 7 is %d\n", 7 > 7);
	printf("Expression 20 >= 19 is %d\n", 20 >= 20 );
	printf("Expression 21 <= 21 is %d\n", 20 <= 21 );

	return 0;
}

You'll frequently see comparison operators in loops and conditional statements.

Operator Precedence

Grasping the order of operations, or operator precedence, is crucial.

Note

Consider the equation: 2 + 2 * 2. What's your answer? If you thought it's 8, don't worry — you're not alone. Even the course creator has had moments of math confusion.

When it comes to precedence, the increment (++) and decrement (--) operators are evaluated first. This is followed by the multiplication (*) and division (/) operators. Lastly, the addition (+) and subtraction (-) operators are evaluated.

Take this code for instance:

To clarify the order of operations, you can use parentheses. So, the expression:

Can be more explicitly written as:

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Section 3. Chapter 4
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