Operators

Arithmetic Operators

Arithmetic operators are used to perform arithmetic operations on variables and data.

Operator	Operation
+	Addition
-	Subtraction
*	Multiplication
/	Division
%	Modulo Operation (Remainder after division)
++	Increment
--	Decrement

Assignment Operators

Assignment operators are used to assign values to variables.

Operator	Operation	Equivalent to
=	a=b	a=b;
+=	a+=b	a=a+b
-=	a-=b	a=a-b
*=	a*=b	a=a*b
/=	a/=b	a=a/b
%=	a%=b	a=a%b

Relational Operators

A relational operator is used to check the relationship between two operands.

Operator	Meaning
<	Less Than
>	Greater Than
<=	Greater Than or Equal To
>=	Less Than or Equal To
==	is Equal To
!=	Not Equal To

Logical Operators

Logical operators are used to check whether an expression is true or false.

Operator	Meaning
&&	Logical AND. True only if all the operands are true.
\|\|	Logical OR. True if at least one of the operands is true.
!	Logical NOT. True only if the operand is false.

Comments

C++ comments are hints that a programmer can add to make their code easier to read and understand. They are completely ignored by C++ compilers.
There are two ways to add comments to code:

// - Single Line Comments
/* */ -Multi-line Comments

Operators Precedence

If an expression contains different operators then they are evaluated according to their precedence.

Precedence	Operator	Description	Associativity
1	a++ a--	Suffix/postfix increment Suffix/postfix decrement	Left to Right
2	++a --a	Prefix increment Prefix decrement	Right to Left
3	a * b a / b a % b	Multiplication Division Modulus	Left to Right
4	a + b a - b	Addition Subtraction	Left to Right
5	< <= > >=	Less than Less than or equal to Greater than Greater than or equal to	Left to Right
6	== !=	Equal to Not equal to	Left to Right
7	&&	Logical AND	Left to Right
8	\|\|	Logical OR	Left to Right

Operators Associvity

If an expression contains different operators having same precedence then they are evaluated according to their Associvity.
For basic arithmetic operators it from left to right.

Mixed expression

If an expression contains different type of values then result is calculated according to higher data type of value present in expression.

#Write a program to read 2 nos and find their sum

  #include⁢stdio.h>
  main()
  {
    int a,b,c;
    printf("Enter 2 numbers ");
    scanf("%d %d",&a,&b);
    c=a+b;
    printf("Sum is %d",c);
  }

Enter 2 numbers 45 55
Sum is 100

#Write a program to read marks for 5 subjects and find total marks

  #include⁢stdio.h>
  main()
  {
    int a,b,c,d,e,t;
    printf("Enter marks for 5 subjects ");
    scanf("%d %d %d %d %d",&a,&b,&c,&d,&e);
    t=a+b+c+d+e;
    printf("Total is %d",t);
  }

Enter marks for 5 subjects
50 60 55 60 65
Total is 290

#Write a program to read length & breadth of Rectangle and find its area and perimeter.

A=L*B
P=2*(L+B)

  #include⁢stdio.h>
  main()
  {
    float L, B, A, P ;
    printf("Enter Length and Breadth");
    scanf("%f %f",&L,&B);
    A=L*B;
    P=2*(L+B);
    printf("Area is %f",A);
    printf("\nPerimeter is %f",P);
  }

Enter Length and Breadth 5.2 3.1
Area is 16.12 
Perimeter is 16.6

#Write a program to read radius of sphere and find its Volume.
V=4/3*𝜋 𝑟³

  #include⁢stdio.h>
  main()
  {
    float r, v ;
    printf("Enter Radius ");
    scanf( "%f" , &r );
    v = 4 / 3 * 3.14 * r * r * r;
    printf("Volume of Sphere is %f",v);
  }

Enter Radius 2.5
Volume of Sphere is 65.416666

#Write a program to read 2 values into variables A and B and exchange their values.

  #include⁢stdio.h>
  main()
  {
    int a , b;
    int temp;
    printf("Enter 2 Numbers ");
    scanf( "%d %d“ , &a , &b );
    printf("\nValue of a=%d b=%d",a,b);
    temp = a;
    a = b;
    b = temp;
    printf("\nValue of a=%d b=%d",a,b);
  }

Enter 2 Numbers 5  7
Value of a = 5 b = 7
Value of a = 7 b = 5

#Write a program to read a number and find its last digit.

  #include⁢stdio.h>
  main()
  {
    int a;
    int x;
    printf("Enter a Number ");
    scanf("%d",&a);
    x = a%10 ;
    printf("Last digit is %d",x);
  }

Enter a Number 28
Last digits is 8

CCITcoder

Introduction to C

DataType and Operation

Conditional statements

Iterative statements

Functions

Array

Pointers

Structures

File I/O

Graphics

Additional Features