In C programming language, the inline keyword is used to suggest the compiler to
replace the function call with the function's code during the compilation process. 
This can improve the performance of the program by reducing the overhead of function 
call.

Note that the inline keyword is only a suggestion to the compiler and it's up to the
compiler to decide whether to inline the function or not. In addition, the function's
code may still be included in the binary even if it's not inlined, so the use of
inline does not necessarily reduce the size of the binary.


uses of inline functions:-

Efficiency: Inline functions are primarily used to improve the performance of
code. By eliminating the overhead of function calls, the program can execute 
faster. Instead of jumping to a different part of the code to execute a 
function and then returning, the code of the inline function is inserted 
directly at the call site.

Small functions: Inline functions are ideal for small functions that are 
frequently called. Instead of wasting time on function call overhead, the
compiler replaces the function call with the actual code of the function, 
reducing the execution time.

Code optimization: Inline functions allow the compiler to perform additional
optimizations. Since the function code is inserted at the call site, the
compiler has more visibility into the surrounding code and can make better
decisions regarding optimizations like constant propagation, loop unrolling,
and dead code elimination.

Header files: Inline functions are often used in header files. Header files 
contain function declarations, and if a function is declared as inline, the
compiler can replace the function calls in different source files with the
actual code from the header file. This avoids duplicate code generation and 
reduces the size of the final executable.

Library functions: Inline functions can be used to create reusable code in 
libraries. By inlining small, commonly used functions, libraries can provide
efficient and optimized code for other programs to use, without the overhead
of function calls.