python消除C语言注释

用python写的小程序，可以消除单行注释//，多行注释

def commentsEliminate1(file1,file2):
    # 获取行数，存储在res
    file = open(file1, "r+")
    res = len(file.readlines())
    # print(res)
    file.close()

    f1 = open(file1, "r+")  # 读取源文件
    f2 = open(file2, "a+")  # 写向目标文件
    flag = 0  # 标记位，标记是否进入多行注释
    while res > 0:
        res -= 1
        code = f1.readline()  # 读取文件
        length = len(code)  # 每行字符数
        for i in range(length):
            # 单行注释//
            if flag == 0 and code[i] == '/' and code[i + 1] == '/':
                f2.write("n")
                break
            # 多行注释
            elif flag == 0 and code[i] == '/' and code[i + 1] == '*':
                flag = 1
            elif flag == 1 and code[i] == '*' and code[i + 1] == '/':
                flag = 0
                break
            elif flag == 1:
                continue
            elif flag == 0:
                f2.write(code[i])
    f1.close()
    f2.close()
    print("Success")

if __name__ == '__main__':
    file1="test.c"
    file2="test1.c"
    commentsEliminate1(file1,file2)

源程序：

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