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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

book
Multiplication, Division and Modulo

Multiplication Operator

The multiplication operator * yields the product of its operands. For instance, if you're trying to determine the amount of water required to fill a pool:

c

Main

copy

              
12345678910111213141516

            
#include <stdio.h>

int main()
{
	int height = 2; // in meters
	int width = 7; // in meters
	int length = 10; // in meters
	
	// A cubic meter contains one thousand liters

	int liters = (height * width * length) * 1000;

	printf("Size of pool: %d liters", liters);

	return 0;
}

Division Operator

The division operator / divides the left operand by the right one.

Suppose you want to calculate a car's speed:

c

Main

copy

              
123456789101112

            
#include <stdio.h>

int main()
{
	int s = 200; // in meters
	double t = 3; // three hours
	double v = s / t;

	printf("Velocity =  %f m/h", v);

	return 0;
}

Using double variables ensures our result can be a decimal value, providing a more accurate answer. If we only worked with integer types, the result would also be an integer:

python
c

Main

copy

              
123456789101112

            
#include <stdio.h>

int main()
{
	int s = 200; // in meters
	int t = 3;   // three hours
	// without `double v` variable

	printf("Velocity =  %d m/h", s/t); 

	return 0;
}

It's important to note that merely changing the format specifier won't fix an incorrect integer division:

c

Main

copy

              
1234567891011

            
#include <stdio.h>

int main()
{
	int s = 200; // in meters
	int t = 3; // three hours

	printf("Velocity =  %f m/h", s/t); // changed specifier

	return 0;
}

However, there's a way to get a correct division without introducing another variable:

c

Main

copy

              
1234567891011

            
#include <stdio.h>

int main()
{
	int s = 200; // in meters
	double t = 3; // three hours

	printf("Velocity =  %f m/h", s/t); // changed specificator

	return 0;
}

Note

For a division to yield a decimal result, at least one of the operands should be of a decimal type like double.

Modulo Operator

The % operator returns the remainder of a division. For instance:

c

Main

copy

              
1234567891011

            
#include <stdio.h>

int main()
{
	printf("Modulo 8 %% 5 = %d\n", 8 % 5); 
	printf("Modulo 10 %% 3 = %d\n", 10 % 3);
	printf("Modulo 7 %% 5 = %d\n", 7 % 5);
	printf("Modulo 20 %% 5 = %d\n", 20 % 5);

	return 0;
}

Note

If you're trying to display the % character in a string (e.g., in a printf statement), you'd use %% to represent a single %. This tells the compiler you want to print the % character and not use it as a format specifier.

question mark

So, what's the value of the given expression?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 3. ChapterΒ 3

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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

book
Multiplication, Division and Modulo

Multiplication Operator

The multiplication operator * yields the product of its operands. For instance, if you're trying to determine the amount of water required to fill a pool:

c

Main

copy

              
12345678910111213141516

            
#include <stdio.h>

int main()
{
	int height = 2; // in meters
	int width = 7; // in meters
	int length = 10; // in meters
	
	// A cubic meter contains one thousand liters

	int liters = (height * width * length) * 1000;

	printf("Size of pool: %d liters", liters);

	return 0;
}

Division Operator

The division operator / divides the left operand by the right one.

Suppose you want to calculate a car's speed:

c

Main

copy

              
123456789101112

            
#include <stdio.h>

int main()
{
	int s = 200; // in meters
	double t = 3; // three hours
	double v = s / t;

	printf("Velocity =  %f m/h", v);

	return 0;
}

Using double variables ensures our result can be a decimal value, providing a more accurate answer. If we only worked with integer types, the result would also be an integer:

python
c

Main

copy

              
123456789101112

            
#include <stdio.h>

int main()
{
	int s = 200; // in meters
	int t = 3;   // three hours
	// without `double v` variable

	printf("Velocity =  %d m/h", s/t); 

	return 0;
}

It's important to note that merely changing the format specifier won't fix an incorrect integer division:

c

Main

copy

              
1234567891011

            
#include <stdio.h>

int main()
{
	int s = 200; // in meters
	int t = 3; // three hours

	printf("Velocity =  %f m/h", s/t); // changed specifier

	return 0;
}

However, there's a way to get a correct division without introducing another variable:

c

Main

copy

              
1234567891011

            
#include <stdio.h>

int main()
{
	int s = 200; // in meters
	double t = 3; // three hours

	printf("Velocity =  %f m/h", s/t); // changed specificator

	return 0;
}

Note

For a division to yield a decimal result, at least one of the operands should be of a decimal type like double.

Modulo Operator

The % operator returns the remainder of a division. For instance:

c

Main

copy

              
1234567891011

            
#include <stdio.h>

int main()
{
	printf("Modulo 8 %% 5 = %d\n", 8 % 5); 
	printf("Modulo 10 %% 3 = %d\n", 10 % 3);
	printf("Modulo 7 %% 5 = %d\n", 7 % 5);
	printf("Modulo 20 %% 5 = %d\n", 20 % 5);

	return 0;
}

Note

If you're trying to display the % character in a string (e.g., in a printf statement), you'd use %% to represent a single %. This tells the compiler you want to print the % character and not use it as a format specifier.

question mark

So, what's the value of the given expression?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 3. ChapterΒ 3
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