Step by Step solution about How to resolve the algorithm Named parameters step by step in the C programming language

This C code demonstrates the use of named parameters, default parameters, and a convenience wrapper for default parameters. It defines a struct called FTest_args to represent the arguments of a function.

1. Named Parameters:

   • The FTest function takes an argument of type FTest_args and prints the values of its fields x, y, and z.
   • The FT macro is defined to simplify the call to FTest. It allows you to specify the arguments by name. For example, FT(.z = 47, .y = 10, .x = 42) sets the z field to 47, the y field to 10, and the x field to 42.

2. Default Parameters:

   • The DFT macro is defined to call the FTest function with default values for x, y, and z. The default values are set to 142, 143, and 144, respectively. You can override these values by specifying named parameters. For example, DFT(.z = 99) sets the z field to 99 while keeping the x and y fields at their default values.

3. Convenience Wrapper for Default Parameters:

   • The FTest2 function is similar to FTest, but it takes three separate integers as arguments instead of a struct.
   • The FTest2_default_wrapper function is a wrapper that converts a FTest_args struct to three separate integers and calls FTest2.
   • The DF2 macro is defined to use the FTest2_default_wrapper function with default values for x, y, and z.

In the main function, various examples of using named parameters, default parameters, and the wrapper are shown.

#include <stdio.h>

// 1. Named parameters

typedef struct { int x, y, z; } FTest_args;

void FTest (FTest_args args) {
	printf("x: %d, y: %d, z: %d\n", args.x, args.y, args.z);
}

#define FT(...) FTest((FTest_args){ __VA_ARGS__ })


// 2. Default parameters

#define DFT(...) FTest((FTest_args){ .x = 142, .y = 143, .z = 144, __VA_ARGS__ })


// 3. Convenience wrapper to avoid accessing args as "args.name"

void FTest2 (int x, int y, int z) {
	printf("x: %d, y: %d, z: %d\n", x, y, z);
}

static inline void FTest2_default_wrapper (FTest_args args) {
	return FTest2(args.x, args.y, args.z);
}

#define DF2(...) FTest2_default_wrapper((FTest_args){ .x = 142, .y = 143, .z = 144, __VA_ARGS__ })


int main(int argc, char **argv)
{
	// Named parameters
	FTest((FTest_args){ .y = 10 });
	FTest((FTest_args){ .y = 10, .z = 42 });
	FT( .z = 47, .y = 10, .x = 42 );

	// Default parameters
	DFT();
	DFT( .z = 99 );

	// Default parameters with wrapper
	DF2();
	DF2( .z = 99 );

	return 0;
}