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Jul 07, 2016 Understand the concept of operators in C. In this video tutorial we will learn what operators are and also the types of operators in C. Here are the type. An if statement can be followed by an optional else statement, which executes when the boolean expression is false. The syntax of an if.else statement in C is −. Re: Expected primary-expression before '=' token The days of the week as you have defined them are variables. They have no particular value (they are uninitialized). It looks like you either want them to be symbolic integers, or else strings; either way will work but will need to be different than what you have now. In visual c it compiles and works but in devc it gives this output.
Primary Expression Error
Unary operator is operators that act upon a single operand to produce a new value. The unary operators are as follows:
![Dev Dev](/uploads/1/2/6/3/126378251/832784417.png)
Operators | Description |
---|---|
Indirection operator (*) | It operates on a pointer variable and returns an l-value equivalent to the value at the pointer address. This is called 'dereferencing' the pointer. |
Address-of operator (&) | The unary address-of operator (&) takes the address of its operand. The operand of the address-of operator can be either a function designator or an l-value that designates an object that is not a bit field and is not declared with the register storage-class specifier. |
Unary plus operator (+) | The result of the unary plus operator (+) is the value of its operand. The operand to the unary plus operator must be of an arithmetic type. |
Unary negation operator (-) | The - (unary minus) operator negates the value of the operand. The operand can have any arithmetic type. The result is not an lvalue. |
Logical negation operator (!) | The logical negation operator (!) reverses the meaning of its operand. The operand must be of arithmetic or pointer type (or an expression that evaluates to arithmetic or pointer type). The operand is implicitly converted to type bool. |
One's complement operator (~) | The one's complement operator sometimes called the 'bitwise complement' or 'bitwise NOT' operator, produces the bitwise one's complement of its operand. The operand must be of integral type. |
Prefix increment operator (++) | The prefix increment operator ( ++ ) adds one to its operand; this incremented value is the result of the expression. The operand must be an l-value not of type const. The result is an l-value of the same type as the operand. |
Prefix decrement operator (--) | The prefix decrement operator ( -- ) subtracts one from its operand; this decremented value is the result of the expression. The operand must be an l-value not of type const. The result is an l-value of the same type as the operand. |
Cast operator () | A type cast provides a method for explicit conversion of the type of an object in a specific situation. The compiler treats cast-expression as type type-name after a typecast has been made. |
sizeof operator | It is a compile-time unary operator which can be used to compute the size of its operand. |
new operator | It is a memory allocation operator that is used to allocate memory dynamically. |
delete operator | It is a memory allocation operator that is used to deallocate memory that was dynamically allocated. |
![Expression Expression](/uploads/1/2/6/3/126378251/746154380.png)
These operators have right-to-left associativity. Unary expressions generally involve syntax that precedes a postfix or primary expression.
Dev C++ Download For Windows 7
Example
Primary Expression Dev C 2017
Let's look at an example of the -(minus) and casting() unary operators.
Output
Expected Primary-expression Before Int Dev C++
This gives the output −