Starting template for C projects

banana.c

/*
 * banana.c
 *
 * author: Furkan Cayci
 *
 * description: calculate and give the result for Rosenbrock's banana function.
 * https://en.wikipedia.org/wiki/Rosenbrock_function
 *
 */
#include "banana.h"

#include <math.h>
#include <stdio.h>

/* define variables */
double a = 1.0;
double b = 100.0;

/* Rosenbrock's banana function definition */
double banana(double x, double y) {
    printf(
        "banana.c: Calculating Rosenbrock's banana function with a: %.3f, "
        "b: %.3f..\n",
        a, b);

    return pow((a - x), 2) + b * pow((y - pow(x, 2)), 2);
}

banana.h

#ifndef BANANA_H_
#define BANANA_H_

/* function declaration */
double banana(double, double);

#endif /* BANANA_H_ */

main.c

/*
 * main.c
 *
 * author: Furkan Cayci
 *
 * description: Basic program that calls Rosenbrock's banana function for
 * a given x an y values and prints the result
 */

#include <stdio.h>
#include <stdlib.h>

#include "banana.h"

/* bring a and b from other file if -really- needed */
extern double a;
extern double b;

int main(void) {
    printf("main.c: Hello from main \n");

    double x = -1.9;
    double y = 2.4;

    double res = banana(x, y);
    printf("main.c: Result for x: %.1f, y: %.1f is: %.3f\n", x, y, res);

    /* change initial conditions if -really- needed */
    a = 1.0;
    b = 1.0;

    res = banana(x, y);
    printf("main.c: Result for x: %.1f, y: %.1f is: %.3f\n", x, y, res);

    return EXIT_SUCCESS;
}

Makefile

TARGET = banana
CC = gcc
LD = gcc

# Add your sources here
SRCS += main.c
SRCS += banana.c

INCLUDES += -I.

OBJS = $(SRCS:.c=.o)

CFLAGS += -std=c11 # c11 standard
CFLAGS += -O0 # optimization is off
CFLAGS += -fno-common
CFLAGS += -Wall # turn on warnings
CFLAGS += -Wextra # extra warnings
CFLAGS += -pedantic # strict ISO warnings
CFLAGS += -Wno-unused-variable # Do not show unusued warnings
CFLAGS += -Wmissing-include-dirs
CFLAGS += -Wsign-compare
CFLAGS += -Wcast-align
CFLAGS += -Wconversion # neg int const implicitly converted to uint

LDFLAGS += -lc -lm

all: $(TARGET)

$(TARGET): $(OBJS)
	$(CC) $(OBJS) $(LDFLAGS) -o $(TARGET)
	@echo "Successfully finished..."

%.o: %.c
	$(CC) $(CFLAGS) $(INCLUDES) -c $< -o $@

clean:
	@rm -rf $(TARGET)
	@rm -rf *.o

.PHONY: all clean