#pragma in C
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The #pragma in C is used to provide additional information to the compiler, control compiler-specific behaviors, or enable/disable certain features like optimizations, warnings, or dependencies.
It allows you to fine-tune the compilation process and can be used for platform-specific or optimization-related tasks.
Syntax of #pragma in C
#pragma directive_name [option]
Example:
// Program for #pragma in C #include<stdio.h>#pragma GCC optimize("O3") int main() { printf("Optimized code example.\n"); return 0; }
Output:
Optimized code example.
Uses of #pragma in C
Optimizations: To instruct the compiler to apply specific optimization levels.
#pragma GCC optimize("O3")
Warnings: To enable or disable certain compiler warnings.
#pragma GCC diagnostic warning "-Wunused-variable"
Platform-specific Code: To handle platform-specific code or dependencies.
#pragma once
Dependencies: To link or include specific libraries or headers.
#pragma comment(lib, "mylib.lib")
Inline Functions: To hint the compiler to inline a function.
#pragma inline
Data Alignment: To specify the alignment requirements for data structures.
#pragma pack(1)
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