Debug exercise

exercises/debug/Makefile

+CFLAGS = -o -w -std=gnu99
+CFLAGS += `/usr/bin/gsl-config --cflags`
+LDLIBS += $(shell /usr/bin/gsl-config --libs)
+
+all: output ; cat $<
+output: main ; ./$< > ./$@
+clean: ; $(RM) main output
+
+
+.PHONEY: test
+test:
+	echo $(CFLAGS)
+

exercises/debug/main.c

+#include"stdio.h"
+#include"gsl/gsl_matrix.h"
+
+int print_half_00(gsl_matrix* m)
+{
+	double half = 1.0/2;
+	int status = printf( "half m_{00} = %g\n", gsl_matrix_get(m,0,0)*half );
+	//gsl_matrix_free(m);
+	return status;
+}
+
+int main(void)
+{
+	gsl_matrix* m = gsl_matrix_alloc(1,1);
+	gsl_matrix_set(m,0,0,66);
+	printf("half m_{00} (should be 33):\n");
+	int status = print_half_00(m);
+	if(status==0)
+		printf("status=%i : SOMETHING WENT TERRIBLY WRONG (status=0)\n",status);
+	else
+		printf("status=%i : everything went just fine (status>0)\n",status);
+	gsl_matrix_free(m);
+return 0;
+}
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