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#pragma Directive in C/C++
The preprocessor directive #pragma is used to provide the additional information to the compiler in C/C++ language. This is used by the compiler to provide some special features.
Here is the syntax of #pragma directive in C/C++ language,
#pragma token_name
The table of some of #pragma directives in C/C++ language is given as follows,
| Sr.No. | #pragma Directives & Description |
|---|---|
| 1 | #pragma startup Before the execution of main(), the function specified in pragma is needed to run. |
| 2 | #pragma exit Before the end of program, the function specified in pragma is needed to run. |
| 3 | #pragma warn Used to hide the warning messages. |
| 4 | #pragma GCC dependency Checks the dates of current and other file. If other file is recent, it shows a warning message. |
| 5 | #pragma GCC system_header It treats the code of current file as if it came from system header. |
| 6 | #pragma GCC poison Used to block an identifier from the program. |
Here is an example of #pragma directive in C language,
Example
#include<stdio.h>
int display();
#pragma startup display
#pragma exit display
int main() {
printf("\nI am in main function");
return 0;
}
int display() {
printf("\nI am in display function");
return 0;
}
Updated on: 25-Jun-2020
3K+ Views
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