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<b Is a smaller than b? |
→ |
| > | 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”);//commaprintf(“%d”, a), printf(“%d”, b);
return 0;
}
This will give..
Hello World!
42
:D
Two Things to be Aware when you Declare a Variable
1. INTRODUCE FIRST
int main(void)
{
int a;//declare
int b;//declarea=5;//input
b=1;//inputprintf(“%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;//inputprintf(“%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
Sushae
Bermuda's Unescapable Triangle 
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