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Expression and Statement in C#

Difference between statement and expression


In programming language terminology, an “expression” is a combination of values and functions that are combined and interpreted by the compiler to create a new value, as opposed to a “statement” which is just a standalone unit of execution and doesn’t return anything. 

C# Expressions

An expression in C# is a combination of operands (variables, literals, method calls) and operators that can be evaluated to a single value. To be precise, an expression must have at least one operand but may not have any operator.
Let's look at the example below:
float price;
price = 42.05;
Here, 42.05 is an expression. Also, price = 42.05 is an expression too.
int x, y, z, sum;
sum = x + y + z;
Here, x + y + z is an expression.
if (age>=18 && age<58)
 Console.WriteLine("Eligible to work");
Here, (age>=18 && age<58) is an expression that returns a boolean value. "Eligible to work" is also an expression.

C# Statements

A statement is a basic unit of execution of a program. A program consists of multiple statements.
For example:
int age = 21;
Int marks = 90;

In the above example, both lines above are statements.

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