Lecture 3 exercise

exercises/lec3-math/Makefile

+CC = gcc
+CFLAGS = -O -std=gnu11
+LDLIBS = -lm
+
+default: outmath.txt outprecision.txt
+	cat outmath.txt
+	cat outprecision.txt
+
+outmath.txt: math
+	./math > outmath.txt
+
+outprecision.txt: precision
+	./precision > outprecision.txt
+
+math: math.o
+	$(CC) math.o -o math $(LDLIBS)
+
+math.o: math.c
+	$(CC) $(CFLAGS) -c math.c -o math.o 
+
+precision: precision.o
+	$(CC) precision.o -o precision $(LDLIBS)
+
+precision.o: precision.c
+	$(CC) $(CFLAGS) -c precision.c -o precision.o
+
+.PHONEY: clean
+clean:
+	$(RM) outmath.txt outprecision.txt math math.o precision precision.o

exercises/lec3-math/math.c

+#include<math.h>
+#include<complex.h>
+#include<stdio.h>
+
+int main() {
+	double gam = tgamma(5);
+	printf("Gamma function of 5 = %g\n",gam);
+
+	double bes = j1(0.5);
+	printf("Bessel function of 0.5 = %g\n",bes);
+
+	double complex sqr = csqrt(-2);
+	printf("Square root of -2 = %g + %gi\n",creal(sqr),cimag(sqr));
+
+	double complex eipi = cpow(M_E,(I*M_PI));
+	printf("e to the power i*pi = %g + %gi\n",creal(eipi),cimag(eipi));
+
+	double complex ei = cpow(M_E,I);
+	printf("e to the power i = %g + %gi\n",creal(ei),cimag(ei));
+
+	double complex ie = cpow(I,M_E);
+	printf("i to the power e = %g + %gi\n",creal(ie),cimag(ie));
+
+	double complex ii = cpow(I,I);
+	printf("i to the power i = %g + %gi\n",creal(ii),cimag(ii));
+
+return 0;
+}

exercises/lec3-math/precision.c

+#include<stdio.h>
+#include<math.h>
+
+int main(){
+float floa = 1.f/9;
+double doub = 1./9;
+long double lodo= 1.L/9;
+
+printf("The precision of different variable types:\n");
+printf("Float: %.25g\n",floa);
+printf("Double: %.25lg\n",doub);
+printf("Long double: %.25Lg\n",lodo);
+return 0;
+}