砝码分盐问题——从数学和计算机的角度分析(8)

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Content0. 问题 1. 一些方法 2. 从数学的角度分析 3. 能否编程计算？ 4. 一个改进的方法 5. 再改进的方法 6. 能否直接计算求出所有正确解？ 7. 一个更为简单的方法 8. 所有代码的自动编译、运行 8.1如何自动编译？8.2如何自动运行并保存结果？9. 问题扩展 10. 体会 11. 总结 Reference附录 1 ：数学分解的代码weight1.c 附录 2 ：数学分解程序weight1 的运行结果 附录 3 ：树结构分解的代码weight2.c 附录 4 ：再改进的方法的代码weight3.1.c/3.2.c/3.3.c 附录 5 ：再改进的方法的代码weight3.1.c/3.2.c/3.3.c 的输出结果附录 6 ：直接计算正确分解的代码weight4.c 附录 7 ：一个更简单的方法的代码weight5.1.c/5.2.c/5.3.c
8. 所有代码的自动编译、运行 8.1 如何自动编译？ 要自动编译所有的例子代码，很容易想到makefile文件。makefile的编写方法，可参考跟我一起写makefile、驾驭makefile、编写makefile。对于该例子，笔者编写的makefile文件如下。

CC = gcc
CXXFLAGS += -g -Wall -Wextra

TARGET = weight1 weight2 weight3.1 weight3.2 weight3.3 weight4 weight5.1 weight5.2 weight5.3

CLEANUP = rm -f $(TARGET) *.o

all : $(TARGET)

clean :
	$(CLEANUP)

weight1.o: weight1.c
	$(CC) $(CXXFLAGS) -c $^
weight2.o: weight2.c
	$(CC) $(CXXFLAGS) -c $^
weight3.1.o: weight3.1.c
	$(CC) $(CXXFLAGS) -c $^
weight3.2.o: weight3.2.c
	$(CC) $(CXXFLAGS) -c $^
weight3.3.o: weight3.3.c
	$(CC) $(CXXFLAGS) -c $^
weight4.o: weight4.c
	$(CC) $(CXXFLAGS) -c $^
weight5.1.o: weight5.1.c
	$(CC) $(CXXFLAGS) -c $^
weight5.2.o: weight5.2.c
	$(CC) $(CXXFLAGS) -c $^
weight5.3.o: weight5.3.c
	$(CC) $(CXXFLAGS) -c $^

all:
weight1: weight1.o
	$(CC) $(CXXFLAGS) $^ -o $@
weight2: weight2.o
	$(CC) $(CXXFLAGS) $^ -o $@
weight3.1: weight3.1.o
	$(CC) $(CXXFLAGS) $^ -o $@
weight3.2: weight3.2.o
	$(CC) $(CXXFLAGS) $^ -o $@
weight3.3: weight3.3.o
	$(CC) $(CXXFLAGS) $^ -o $@
weight4: weight4.o
	$(CC) $(CXXFLAGS) $^ -o $@
weight5.1.o: weight5.1.c
	$(CC) $(CXXFLAGS) -c $^
weight5.2.o: weight5.2.c
	$(CC) $(CXXFLAGS) -c $^
weight5.3.o: weight5.3.c
	$(CC) $(CXXFLAGS) -c $^
	rm -f *.o

8.2 如何自动运行并保存结果？ 编写自动运行并保存运行结果的脚本autorun.sh，运行后，其结果被自动保存到同名的.txt文件中，如下。

echo -e "start to run all examples\n"

echo "weight1 running ..."
./weight1 > weight1.txt
echo "    result is in weight1.txt"

echo "weight2 running ..."
./weight2 > weight2.txt
echo "    result is in weight2.txt"

echo "weight3.1 running ..."
./weight3.1 > weight3.1.txt
echo "    result is in weight3.1.txt"

echo "weight3.2 running ..."
./weight3.2 > weight3.2.txt
echo "    result is in weight3.2.txt"

echo "weight3.3 running ..."
./weight3.3 > weight3.3.txt
echo "    result is in weight3.3.txt"

echo "weight4 running ..."
./weight4 > weight4.txt
echo "    result is in weight4.txt\n"

echo "weight5.1 running ..."
./weight5.1 > weight5.1.txt
echo "    result is in weight5.1.txt"

echo "weight5.2 running ..."
./weight5.2 > weight5.2.txt
echo "    result is in weight5.2.txt"

echo "weight5.3 running ..."
./weight5.3 > weight5.3.txt
echo "    result is in weight5.3.txt"

echo "done. bye."

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