ELEVATE SKILLS!
Q: 1 What is the value of y after executing the following code?
#define square(p) p*p
void main()
{
int y=square(2+3);
printf("%d",y);
}
13
25
11
Illegal Expression
[ Option C ]
In this program, square(p) is defined as a macro. A macro in C works by simple text substitution, meaning the compiler directly replaces the macro with its definition without adding any extra brackets.
When the statement square(2+3) is written, it is replaced by 2+3*2+3. According to operator precedence rules, multiplication has higher priority than addition, so 3*2 is evaluated first. This makes the expression 2+6+3, which results in the value 11.
Q: 2 The preprocessors in C are defined with ________________ character.
/
#
*
$
[ Option B ]
In C programming, Preprocessor Directives are lines included in the code that are processed before compilation. These directives always begin with the # (Hash) symbol. Examples of commonly used preprocessor directives starting with # include, #define, #ifdef, #ifndef etc.
| PREPROCESSOR DIRECTIVE | DESCRIPTION |
|---|---|
| #include | Includes standard or user-defined header files in the program. |
| #define | Defines a macro or symbolic constant. |
| #undef | Undefines a previously defined macro. |
| #ifdef | Checks if a macro is defined, includes code if true. |
| #ifndef | Checks if a macro is not defined, includes code if true. |
| #if | Tests a compile-time condition, includes code if true. |
| #else | Specifies alternative code if #if or #ifdef condition is false. |
| #elif | Combines else and if in conditional compilation. |
| #endif | Ends the conditional directive started by #if, #ifdef, #ifndef. |
| #error | Generates a compilation error with a message. |
| #pragma | Provides special instructions to the compiler. |
| #line | Changes the reported line number and filename for errors. |
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