What is global variable in C?

• Environment variable is a variable that will be available for all C applications and C programs.
• Once environment variables are exported, we can access them from anywhere in a C program without declaring and initializing in an application or C program.

• The symbols which are used to perform logical and mathematical operations in a C program are called C operators.
• These C operators join individual constants and variables to form expressions. Operators, functions, constants and variables are combined together to form expressions.

• The symbols which are used to perform logical and mathematical operations in a C program are called C operators.
• These C operators join individual constants and variables to form expressions. Operators, functions, constants and variables are combined together to form expressions.

Ternary operator is same as if else control statement in C.

Syntax : (Condition? true_value: false_value);

Example: (A > 100? 0: 1);

• C Arithmetic operators are used to perform mathematical calculations like addition, subtraction, multiplication, division and modulus in C programs.
• Arithmetic operators are +, -, *, /, %

• Assignment operators are used to assign the values to the variables.
• Assignment operators are =, +=, -=, /+, %= etc.

• Relational operators are used to find the relation between two variables. i.e. to compare the values of two variables in a C program.
• Relational operators are >, <, >=, <=, ==, !=

• Logical operators are used to perform logical operations on the given expressions.
• There are 3 logical operators in C language. They are,

1. logical AND (&&)
2. logical OR (||)
3. logical NOT (!)

• Bitwise operators are used to perform bit operations. Decimal values are converted into binary values which are the sequence of bits and bit wise operators work on these bits.
• Bit wise operators in C language are & (bitwise AND), | (bitwise OR), ~ (bitwise OR), ^ (XOR), << (left shift) and >> (right shift).

There are 3 types of decision making control statements in C language. They are,

1. if statements
2. if else statements
3. nested if statements