Question

所以我发现了一个非常奇怪的sscanf（）函数行为。我有以下代码解析给定的Date字符串：

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输出如下：

#include <stdio.h>

int main()
{
    int year, month, day;

    sscanf("20151106","%4i%2i%2i",&year,&month,&day);
    printf("Year: %04i\tMonth: %02i\tDay: %02i\n",year,month,day);

    sscanf("20151107","%4i%2i%2i",&year,&month,&day);
    printf("Year: %04i\tMonth: %02i\tDay: %02i\n",year,month,day);

    sscanf("20151108","%4i%2i%2i",&year,&month,&day);
    printf("Year: %04i\tMonth: %02i\tDay: %02i\n",year,month,day);

    sscanf("20151109","%4i%2i%2i",&year,&month,&day);
    printf("Year: %04i\tMonth: %02i\tDay: %02i\n",year,month,day);

    sscanf("20151110","%4i%2i%2i",&year,&month,&day);
    printf("Year: %04i\tMonth: %02i\tDay: %02i\n",year,month,day);

    sscanf("20151111","%4i%2i%2i",&year,&month,&day);
    printf("Year: %04i\tMonth: %02i\tDay: %02i\n",year,month,day);


    return 0;
}

为什么sscanf（）错误地解析08.和09.日？

提前致谢！

了Jorg

Answer 1

那是因为你正在使用＆＃34;我＆＃34;而不是＆＃34; d＆＃34;。当使用＆＃34; i＆＃34; format，以0x开头的数字作为基数16读取，以0开头的数字作为基数8。

因此，01到07在基数8和10中是相同的，所以你得到正确的值，但08是零而09是无效的。

更改您的代码以使用＆＃34; d＆＃34;说明符，例如：

#include <stdio.h>

int main()
{
    int year, month, day;

    sscanf("20151108","%4d%2d%2d",&year,&month,&day);
    printf("Year: %04d\tMonth: %02d\tDay: %02d\n",year,month,day);

    return 0;
}

输出：

Year: 2015  Month: 11   Day: 08

sscanf（）的行为不一致

1 个答案: