C Language Operators

What are operators?
Programming languages typically support a set of operators: operations which differ in the calling of syntax and/or the argument passing mode from the language’s functions. Common examples that differ by syntax are mathematical arithmetic operations, e.g. “>” for “greater than”, with names often outside the language’s set of identifiers for functions, and called with a syntax different from the language’s syntax for calling functions. Common examples that differ by argument passing mode are boolean operations, e.g. a short-circuiting conjunction that only evaluates later arguments if earlier ones are not false, in a language with strict call-by-value functions.
Wikipedia

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1. Assignment Operator(=) and Arithmetic Operators(+, -, *, /, %)

 Operator Function Direction of Function = Substitute the value on the right to the left Ex) a=42 ← + Add Left value to the right value Ex) a=45+6 → – Subtract the value on the right from the left Ex) a=5-4 → * Multiply the values Ex) a=4*3 → / Divide the value on the left with the right Ex) a=2/6 → % Divide the value on the left and show the remainder Ex) a=2%6 →

If you doubt what these are (except %), please consider going over your Primary 1 books.

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2. MORE Assignment Operators

 a = a + b a += b a = a – b a -= b a = a * b a *= b a = a / b a /= b a = a % b a %= b

The functions on the left is same as the functions on the right :)
Don’t get confused with += and =+!!

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3. MORE Arithmetic Operators

 Operator Function Direction of Function ++a Add 1 and carry out further functions Ex) a=1 printf(“a is %d”, ++a);[ a is 2 ], a=2 ← a++ Carry out the function and add 1 Ex) a=1 printf(“a is %d”, a++);[ a is 1 ], a=2 ← –a Subtract 1 and carry out further functions Ex) a=1 printf(“a is %d”, –a);[ a is 0 ], a=0 ← a– Carry out the function and subtract 1 Ex) a=1 printf(“a is %d”, a–);[ a is 1 ], a=0 ←

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4. Relational Operators

 Operator Function Direction of Function < a a>b Is a greater than b? → == a==b Does a equal to b? → != a!=b Does a not equal to b? → <= a<=b Is a smaller or equal to b? → >= a>=b Is a greater or equal to b? →

They always give a boolen value :)
therefore..

int val1 = 12;
int val2 = 10;

int result1 = (val1==val2);

printf(“Result : %d”, result1);

wil give

Result : 0

since val1 does not equal to val2.
(1=true, 0=false)

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5. Logical Operators

 Operator Function Direction of Function && If both are true, value is true (and) Ex) a&&b → || If both any one is true, value is true (or) Ex) a || b → ! If it’s true, value is false If it’s false, value is true Ex) !a ←

Once again, boolen values :)

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6. Comma(,) Operator

This operator is used in many ways. it is used when declaring multiple variables, calculating two functions in a single line and much more.

A good example is shown as below

#include <studio.h>

int main(void)
{
int a=4, b=2;//comma here
printf(“Hello “), printf(“World!\n”);//comma

printf(“%d”, a), printf(“%d”, b);
return 0;
}

This will give..

Hello World!
42

:D

1. INTRODUCE FIRST

int main(void)
{
int a;//declare
int b;//declare

a=5;//input
b=1;//input

printf(“%d + %d = %d\n”, a, b, a+b);
return 0;
}

CORRECT :)

int main(void)
{
int a;//declare
a=5;//input
int b;//declare
b=1;//input

printf(“%d + %d = %d\n”, a, b, a+b);
return 0;
}

WRONG :(

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2. NAME IT PROPERLY

3 SIMPLE things! :D

1. Variables consist of Alphabets, Numbers and Underscore(_)

2. C Language differentiates  small letters and CAPITAL LETTERS :D
Therefore val and Val are different variables :)

3. Variable CANNOT start with a Numb3r or be a Key Word! It should also not contain any Space or Special Letters