c语言 获取程序上一次运行时间的程序

1、

#include <stdio.h>
#include <time.h>

void put_data(void)
{
    FILE *fp;
    
    if((fp = fopen("time.txt", "r")) == NULL)
        printf("\aThe program is running for the first time.\n");
    else
    {
        int year, month, day, week, hour, min, sec;
        fscanf(fp, "%d%d%d%d%d%d%d", &year, &month, &day, &week, &hour, &min, &sec);
        printf("The last run of the program: %d-%d-%d; week(%d); %d-%d-%d\n", year, month, day, week, hour, min, sec);
        fclose(fp);
    }
}

void get_data(void)
{
    FILE *fp;
    
    time_t current = time(NULL);
    struct tm *timer = localtime(&current);
    
    if((fp = fopen("time.txt", "w")) == NULL)
        printf("\aFile open failed.\n");
    else
    {
        fprintf(fp, "%d %d %d %d %d %d %d\n",
        timer -> tm_year + 1900,
        timer -> tm_mon + 1,
        timer -> tm_mday,
        timer -> tm_wday,
        timer -> tm_hour,
        timer -> tm_min,
        timer -> tm_sec);
        fclose(fp);    
    } 
}

int main(void)
{
    put_data();
    get_data();
    
    return 0;
}