C - 计算从 X 年到 Y 年的所有日期

发布于 2024-12-22 23:43:21 字数 597 浏览 3 评论 0原文

请忽略，无能是最好的！

只是在一些嵌套的 for 循环中搞乱了一些基本文件 i/o，但输出并不完全是我想要的，尽管我似乎无法得到它工作了。

#include <stdio.h>

int main(void) {
FILE *pFile;
pFile = fopen("dates.txt", "w");
int day, month, year;
for(day = 1; day <= 31; day++) {
 for(month = 1; month <= 12; month++) {
   for(year = 1900; year <= 2050; year++) {
 if(day < 10 && month < 10) {
   fprintf(pFile, "0%d/0%d/%d\n", day, month, year);
 }else {
   fprintf(pFile, "%d/%d/%d\n", day, month, year);
 }
   }
 }
 }
 return 0;
}

任何提示非常感谢！需要注意的是，这不是一项家庭作业，实际上只是一些实验。

干杯。

原文

Please IGNORE, incompetence as its best!

Just messing with some basic file i/o really, in some nested for Loops but the output isn't quite what I want, though I can't seem to get it working.

#include <stdio.h>

int main(void) {
FILE *pFile;
pFile = fopen("dates.txt", "w");
int day, month, year;
for(day = 1; day <= 31; day++) {
 for(month = 1; month <= 12; month++) {
   for(year = 1900; year <= 2050; year++) {
 if(day < 10 && month < 10) {
   fprintf(pFile, "0%d/0%d/%d\n", day, month, year);
 }else {
   fprintf(pFile, "%d/%d/%d\n", day, month, year);
 }
   }
 }
 }
 return 0;
}

Any tips much appreciated! And as a heads up, this isn't an homework task, just some experimentation really.

Cheers.

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满天都是小星星 2024-12-29 23:43:21

您可以使用 mktime 创建日期。然后添加 1 天并创建下一个日期。
这样就可以迭代了。

以下代码显示前 200 个日期。

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

int main(){
    struct tm *lt;

    int i=200;

//time_t t=0;  // first second on epoch
    time_t t=-2209010000; // first second on 1900 (works on GCC, dind't test MSVS compiler)

    while(i--){
        lt = localtime(&t);
        printf("YYYY:MM:DD = %04d:%02d:%02d\n", lt->tm_year+1900, lt->tm_mon+1,     lt->tm_mday);
        lt->tm_hour+=24; // adding 24 hours
        t = mktime(lt);
    }
    return 0;
}

顺便说一句，它工作的日期晚于纪元。至少在我的 x86_64 GNU/Linux 中的 gcc version 4.4.3 上是这样

You can use mktime to create a date. Then add 1 day to it and create the next date.
This way you can iterate.

Following code shows first 200 dates.

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

int main(){
    struct tm *lt;

    int i=200;

//time_t t=0;  // first second on epoch
    time_t t=-2209010000; // first second on 1900 (works on GCC, dind't test MSVS compiler)

    while(i--){
        lt = localtime(&t);
        printf("YYYY:MM:DD = %04d:%02d:%02d\n", lt->tm_year+1900, lt->tm_mon+1,     lt->tm_mday);
        lt->tm_hour+=24; // adding 24 hours
        t = mktime(lt);
    }
    return 0;
}

By the way it works dates behind epoch. At least on my gcc version 4.4.3 in x86_64 GNU/Linux

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