#include<stdio.h>

#define LOG_LEVEL 0

#define LOG_VERBOSE 1
#define LOG_INFO 5
#define LOG_ERROR 10

#define LOG(level, ...) if (LOG_LEVEL <= level) printf(__VA_ARGS__)
#define CHECK_ZERO(d) if (d==0) LOG(LOG_ERROR, "Divide by zero line:%d  file:%s\n", __LINE__, __FILE__)
#define FUNC_START() if (LOG_LEVEL <= LOG_INFO) printf("start %s\n", __func__)
#define FUNC_END() if (LOG_LEVEL <= LOG_INFO) printf("finish %s\n", __func__)
#define TO_UPPER(c) (c>='a' &&c<='z')?c+('A'-'a'):c

void v1()
{
    FUNC_START();
    for (int i=0; i<10; i++)
    {
	CHECK_ZERO(i);
	LOG(LOG_VERBOSE, "%d %c %c\n", i, 'a'+i, TO_UPPER('a'+i));
    }
    FUNC_END();
}

int main(int argc, char * argv[])
{
    for (int i=0; i<argc; i++)
    {
	LOG(LOG_INFO, "%s\n", argv[i]);
    }
    v1();
    
}