An operator instruct the compiler and so compoter to make some calculations. These calculations may be a logical or arithmetic calculations or other type mathematical operations. With these calculations we can manipulate the values to get another result.
Let's start to talk one by one:
We can perform arithmetical operations like adding, multipling, dividing or substracting with arithmetic operators. Below list you can see the arithmetic operators.
|+||Performs adding two or more operands|
|-||Performs subtracting right operand from the left operand|
|*||multiplies two or more operands|
|/||divide left operator by right operator|
|%||return remain from dividing|
|++||Increment : adds "1" to variable (+x : increase by x)|
|--||Decrement - subtracts "1" from variable (+x : increase by x)|
int x = 5 + 7; //returns 12 int y = 15 - 6; //returns 9 int z = y++; //returns 10 int t = x % y //returns 2
We can perform a checking the variables' relations like equality or NOT equality according to each other. Below list you can see the list of relational operators.
|==||Check the operands are equals|
|!=||Check the operands are not equals.|
|>||Check the left operand greater then the right operand|
|<||Check the right operand smaller than the right operand|
|>=||Check the right operand greater or equal to the right operand|
|<=||Check the left operand smaller or equal to the right operand|
a = 5; b= 7; if( a < b ) printf("a is smaller than b"); if( b > a ) printf("b is greater than a"); if( a == b) printf("a and b are equal"); else printf("a and b are not equal"); // this returns a and b are not equal
We can perform logical operations with logical operators. We can use the only boolean terms. Only TRUE-FALSE or 1-0. Below list you can see the list of operators:
|&&||Performs AND operation between logic operands|
|||||Performs OR operation between logic operands|
|!||Performs NOT operation to a logic operand|
boolean a = true; boolean b= false; boolean c = true; a && b // returns FALSE a || b // returns TRUE !c // returns FALSE
We can perform the operations at the bit level of the numerical value with Bitwise operators. The operands first be converted to binary level and then make bitwise operations. We can not use this operators with double and float typed numbers. We can perform a multipling or dividing by 2 with a bitshifting or we can make a logical operation of all bits of two operand. Below list you can see the list of bitwise operators.
|&||Performs AND operations on an operand at bit level|
||||Performs OR operations on an operand at bit level|
|^||Performs XOR operations on an operand at bit level|
|<<||Shifts the bits of left operands to left as much as right operand|
|>>||Shifts the bits of left operands to right as much as right operand|
1111 & 1010 //Returns 1010 1000 | 1001 //Returns 1001 1100100 >> 2 //Returns 0011001 1001 ^ 1100 //Returns 1010
We can perform assigment operations with assignment opeators. We can perform the equalization. We can set the right side value of the operator to the left side variable. Below list you can see the list of operators.
|=||Assign right operand to the left operand|
|+=||Perform adding the right operand to left operand|
|-=||Perform a substraction from left operand to right operand|
|*=||Perform a multiplyng operation with left and right operand and assign the result to left operand|
|/=||Divide left side operand to the right side operand and assign the reslt to left operand back.|
|%=||Perform am mod() operation with left operand and right operand and assign result to left opeand back.|
//Assignmetns the values to left operands a = 5; b = 6; c = 7; a++; //Now variable a is 6 b+=5; //Now variable b is 11 c*=3 //Now variable c is 21
Also C programming language has some important operators. Below you can see them
|sizeof()||This function operator returns the size of variable|
|&||This sign is same with bitwise AND but this will comes at before of variable and it show the varable address|
|*||This is a variable pointer|
|? :||This operators perform a conditional oparational. (variable = is condition true ? then X : else Y)|
You can also take a look at this article for pointers and address: https://thecodeprogram.com/explanation-of-pointers-in-c--
That is all in this article.
Have a good operations in C languages.
I wish you all healthy days.
Burak Hamdi TUFAN