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C Basics

bookSum, Difference, Increment, Decrement

Addition Operator (+)

The + operator adds the values on either side of it. You can also use variables in place of direct values.

Main.c

Main.c

copy

              
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#include <stdio.h>

int main() {
	int carsSold_2022 = 12;
	int carsSold_2023 = 45;

	int carsSold = carsSold_2022 + carsSold_2023;

	printf("Cars sold in two years: %d", carsSold);

	return 0;
}
Note
Note

While some programming languages allow you to concatenate strings using the + operator, like C does not.

Subtraction Operator (-)

The subtraction operator, -, calculates the difference between the values on either side of it.

Main.c

Main.c

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123456789101112

            
#include <stdio.h>

int main() {
	int carsSold_2022_2023 = 200;
	int carsSold_2023 = 57;

	int carsSold_2022 = carsSold_2022_2023 - carsSold_2023;

	printf("Cars sold in 2022: %d", carsSold_2022);

	return 0;
}

You can also use the - sign to convert positive values to their negative counterparts.

Main.c

Main.c

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#include <stdio.h>

int main() {
	int value = 100;
	
	printf("Negative value: %d", -value);

	return 0;
}

Increment Operator (++)

The increment operator, ++, was introduced to simplify code readability. This operator adds 1 to a value, and it's commonly used in loops.

main.c

main.c

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1234567

            
#include <stdio.h>

int main() {
    int value = 100;
    value++; // Equivalent to: value += 1
    printf("Value: %d", value);
}

Decrement Operator (--)

Conversely, the decrement operator, --, subtracts 1 from a value.

main.c

main.c

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1234567

            
#include <stdio.h>

int main() {
    int value = 100;
    value--; // Equivalent to: value -= 1
    printf("Value: %d", value);
}

Pre vs. Post Increment

Increment and decrement operators come in two forms. The distinction lies in the values they return.

Main.c

Main.c

copy

              
1234567891011121314151617

            
#include <stdio.h>

int main()  {
	int a = 5, b = 5;

	// `a` is increased to `6`
	// Then, it is displayed.
	printf("Prefix form a: %d\n", ++a);
	printf("a =  %d\n", a);

	// `5` is displayed
	// Then, `b` is increased to `6`.
	printf("Postfix form b: %d\n", b++);
	printf("b =  %d\n", b);

	return 0;
}
question mark

If b equals 7, what b++ equals to?

Select the correct answer

Tout était clair ?

Comment pouvons-nous l'améliorer ?

Merci pour vos commentaires !

Section 3. Chapitre 2

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Addition Operator (+)

The + operator adds the values on either side of it. You can also use variables in place of direct values.

Main.c

Main.c

copy

              
123456789101112

            
#include <stdio.h>

int main() {
	int carsSold_2022 = 12;
	int carsSold_2023 = 45;

	int carsSold = carsSold_2022 + carsSold_2023;

	printf("Cars sold in two years: %d", carsSold);

	return 0;
}
Note
Note

While some programming languages allow you to concatenate strings using the + operator, like C does not.

Subtraction Operator (-)

The subtraction operator, -, calculates the difference between the values on either side of it.

Main.c

Main.c

copy

              
123456789101112

            
#include <stdio.h>

int main() {
	int carsSold_2022_2023 = 200;
	int carsSold_2023 = 57;

	int carsSold_2022 = carsSold_2022_2023 - carsSold_2023;

	printf("Cars sold in 2022: %d", carsSold_2022);

	return 0;
}

You can also use the - sign to convert positive values to their negative counterparts.

Main.c

Main.c

copy

              
123456789

            
#include <stdio.h>

int main() {
	int value = 100;
	
	printf("Negative value: %d", -value);

	return 0;
}

Increment Operator (++)

The increment operator, ++, was introduced to simplify code readability. This operator adds 1 to a value, and it's commonly used in loops.

main.c

main.c

copy

              
1234567

            
#include <stdio.h>

int main() {
    int value = 100;
    value++; // Equivalent to: value += 1
    printf("Value: %d", value);
}

Decrement Operator (--)

Conversely, the decrement operator, --, subtracts 1 from a value.

main.c

main.c

copy

              
1234567

            
#include <stdio.h>

int main() {
    int value = 100;
    value--; // Equivalent to: value -= 1
    printf("Value: %d", value);
}

Pre vs. Post Increment

Increment and decrement operators come in two forms. The distinction lies in the values they return.

Main.c

Main.c

copy

              
1234567891011121314151617

            
#include <stdio.h>

int main()  {
	int a = 5, b = 5;

	// `a` is increased to `6`
	// Then, it is displayed.
	printf("Prefix form a: %d\n", ++a);
	printf("a =  %d\n", a);

	// `5` is displayed
	// Then, `b` is increased to `6`.
	printf("Postfix form b: %d\n", b++);
	printf("b =  %d\n", b);

	return 0;
}
question mark

If b equals 7, what b++ equals to?

Select the correct answer

Tout était clair ?

Comment pouvons-nous l'améliorer ?

Merci pour vos commentaires !

Section 3. Chapitre 2
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