How to make Makefile?

Makefile_Assignment/Makefile

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+TARGET: exemath
+exemath: main.o libcalc.a
+	gcc main.o -o exemath -L . libcalc.a -lm
+
+libcalc.a: trig_math/trig_math.o common_math/common_math.o complex_math/complex_math.o
+	ar rs libcalc.a common_math/common_math.o complex_math/complex_math.o trig_math/trig_math.o
+
+common_math.o: common_math/common_math.c
+	gcc -c -I common_math common_math/common_math.c -o common_math/common_math.o
+
+complex_math.o: complex_math/complex_math.c
+	gcc -c -I complex_math complex_math/complex_math.c -o complex_math/complex_math.o
+
+trig_math.o: trig_math/trig_math.c
+	gcc -c -I trig_math trig_math/trig_math.c -o trig_math/trig_math.o
+
+main.o: main.c
+	gcc -c -I common_math -I complex_math -I trig_math main.c -o main.o
+
+clean:
+	rm common_math/common_math.o
+	rm complex_math/complex_math.o
+	rm trig_math/trig_math.o
+	rm main.o
+	rm libcalc.a
+	rm exemath

Makefile_Assignment/common_math/common_math.c

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  common_math.c
+ *
+ *    Description:  
+ *
+ *        Version:  1.0
+ *        Created:  04/02/24 07:32:41 PM IST
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  YOUR NAME (), 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+#include "common_math.h"
+#include <stdio.h>
+
+double add (double a, double b){return b + a;}
+double sub (double a, double b){return a - b;}
+double mul (double a, double b){return a * b;}
+double div (double a, double b){
+    if (b == 0){
+        printf("divide by zero not allowed\n");
+        return 0;
+    }
+    return a / b;
+}
+
+double max (double a, double b){
+    if(a > b) 
+        return a;
+    return b;
+}
+
+double min (double a, double b){
+    if(a > b)
+        return b ;
+    return a;
+}
+

Makefile_Assignment/common_math/common_math.h

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  common_math.h
+ *
+ *    Description:  
+ *
+ *        Version:  1.0
+ *        Created:  04/02/24 07:33:21 PM IST
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  YOUR NAME (), 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+#ifndef __COMMON_MATH__
+#define __COMMON_MATH__
+
+double add (double a, double b);
+double sub (double a, double b);
+double mul (double a, double b);
+double div (double a, double b);
+double max (double a, double b);
+double min (double a, double b);
+
+#endif /* __COMMON_MATH__ */
+

Makefile_Assignment/complex_math/complex_math.c

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  complex_math.c
+ *
+ *    Description:  
+ *
+ *        Version:  1.0
+ *        Created:  04/02/24 07:36:03 PM IST
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  YOUR NAME (), 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+#include "complex_math.h"
+complex_n_t cadd(complex_n_t a, complex_n_t b){
+    complex_n_t res;
+    res.re = a.re + b.re;
+    res.imag = a.imag + b.imag;
+    return res;
+}
+
+
+complex_n_t csub(complex_n_t a, complex_n_t b){
+    complex_n_t res;
+    res.re = a.re - b.re;
+    res.imag = a.imag - b.imag;
+    return res;
+}
+

Makefile_Assignment/complex_math/complex_math.h

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  complex_math.h
+ *
+ *    Description:  
+ *
+ *        Version:  1.0
+ *        Created:  04/02/24 07:36:29 PM IST
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  YOUR NAME (), 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+#ifndef __COMPLEX_MATH__
+#define __COMPLEX_MATH__
+
+typedef struct{
+    double re;
+    double imag;
+} complex_n_t;
+
+complex_n_t cadd(complex_n_t a, complex_n_t b);
+complex_n_t csub(complex_n_t a, complex_n_t b);
+
+#endif

Makefile_Assignment/main.c

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  main.c
+ *
+ *    Description:  
+ *
+ *        Version:  1.0
+ *        Created:  04/02/24 07:38:54 PM IST
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  YOUR NAME (), 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+#include "common_math/common_math.h"
+#include "complex_math/complex_math.h"
+#include "trig_math/trig_math.h"
+#include <stdio.h>
+
+int main(int argc, char **argv){
+    double res, a = 45.0, b = 90.0;
+    complex_n_t cres, ca,cb;
+    res = a + b;
+    printf("two numbers added = %f\n", res);
+    printf("sine of %f = %f\n", a, sine(a));
+    ca.re = 1.0, ca.imag = 2.0;
+    cb.re = 2.0, cb.imag = 3.0;
+    cres = cadd(ca, cb);
+    printf("adding two complex numbers : %f + %f\n", cres.re, cres.imag);
+
+
+    return 0;
+}

Makefile_Assignment/trig_math/trig_math.c

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  trig_math.c
+ *
+ *    Description:  
+ *
+ *        Version:  1.0
+ *        Created:  04/02/24 07:37:35 PM IST
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  YOUR NAME (), 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+#include "trig_math.h"
+#include <math.h>
+
+double sine(double x){
+    return sin(x*(PI/180));
+}
+
+
+double cosine(double x){
+    return cos(x*(PI/180));
+}

Makefile_Assignment/trig_math/trig_math.h

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  trig_math.h
+ *
+ *    Description:  
+ *
+ *        Version:  1.0
+ *        Created:  04/02/24 07:37:55 PM IST
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  YOUR NAME (), 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+#ifndef __TRIG_MATH__
+#define __TRIG_MATH__
+
+#define PI 3.142
+
+double sine(double x);
+double cosine(double x);
+
+#endif