C Programming

ARITHMETIC OPERATORS
The symbols of the arithmetic operators are:-

Operation	Operator	Comment	Value of Sum before	Value of sum after
Multiply	*	sum = sum * 2;	4	8
Divide	/	sum = sum / 2;	4	2
Addition	+	sum = sum + 2;	4	6
Subtraction	-	sum = sum -2;	4	2
Increment	++	++sum;	4	5
Decrement	--	--sum;	4	3
Modulus	%	sum = sum % 3;	4	1

The following code fragment adds the variables loop and count together, leaving the result in the variable sum

        sum = loop + count;

Note: If the modulus % sign is needed to be displayed as part of a text string, use two, ie %%


	#include <stdio.h>

	main()
	{
		int sum = 50;
		float modulus;
    
    		modulus = sum % 10;
		printf("The %% of %d by 10 is %f\n", sum, modulus);
	}


	Sample Program Output
	The % of 50 by 10 is 0.000000

CLASS EXERCISE C5
What does the following change do to the printed output of the previous program?


	printf("The %% of %d by 10 is %.2f\n", sum, modulus);

Answers

Increment
The increment operator adds one to the value of the variable. The following code fragment (part of a program) adds one to the value of count, so that after the statement is executed, count has a value of 5.

	int count = 4;
	count++;

Decrement
The decrement operator subtracts one from the value of the variable. The following code fragment (part of a program) subtracts one from the value of count, so that after the statement is executed, count has a value of 3.

	int count = 4;
	count++;

Modulus
The modulus operator assigns the remainder left over after a division the value of the variable. The following code fragment (part of a program) uses the modulus operator to calculate the modulus of 20 % 3. To work this out, divide 20 by 3. Now 3 divides into 20 six times, with a remainder left over of 2. So the value 2 (the remainder) is assigned to count.

	int count;
	count = 20 % 3;

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