What is the difference between you equals 10 and you equals equals 10 in c language?

Answer 1

The = operator is the assignment operator.

The == operator is the equality or equals operator.

The = operator is the assignment operator. We use it to assign a value (the right hand operand) to an object (the left hand operand). The value must be of the same type as the object unless the value can implicitly convert to the object's type. If not, we must explicitly cast the value to the appropriate type. The operator evaluates to the value of the object after assignment, thus creating a temporary value that can be used in other expressions.

Examples:

int you;

you = 10; // assign the value 10 to the object named 'you'

int me, you;

me = 10;

you = 10;

Note that the second example can also be written:

int me, you;

me = you = 10;

This is because the expression 'you = 10' evaluates to the temporary value 10 (the value of 'you' after assignment) which we then assign to 'me'. Operators are evaluated according to operator precedence, and assignment 'chains' like this are always evaluated from right to left.

The == operator is the equality or equals operator. We use it to determine if two object's have the same value. If so, the expression evaluates true, otherwise false. Operators that evaluate true or false are known as Boolean operators (functions that return true or false are known as predicates).

Typically we use the == operator in conditional expressions:

if (a == b) {

// code to execute when the value of a is equal to the value of b

} else {

// code to execute when the value of a is not equal to the value of b

}

while (a == b) {

// This code will loop repeatedly so long as a is equal to b at the beginning of each iteration

}

The == operator is one of six Boolean operators that can be used to compare object values:

== : equal

!= : not equal

< : less than

<= : less than or equal

> : greater than

>= : greater than or equal