掃描功能只讀取輸入的4位數

Question

我在寫一個程序來獲取今天的日子，並在明天打印出來。但是，當我嘗試獲取今天的日期時，scanf函數似乎只讀取前四位數字。輸出是錯誤的。

例如：如果我把08 19 1995年，讀0作爲today.month，8 today.day，19 today.year

的代碼是：

//Write a function to print out tomorrow's date 

#include <stdio.h> 
#include <stdbool.h> 

struct date 
{ 
    int month; 
    int day; 
    int year; 
}; 

int main(void) 
{ 
    struct date today, tomorrow; 
    int numberofdays(struct date d); 

    //get today's date 
    printf("Please enter today's date (mm dd yyyy):"); 
    scanf("%i%i%i",&today.month, &today.day, &today.year); 

    //sytax to find the tomorrow's date 
    if(today.day == numberofdays(today)) 
    { 
     if(today.month==12) //end of the year 
     { 
      tomorrow.day=1; 
      tomorrow.month=1; 
      tomorrow.year=today.year+1; 
     } 
     else //end of the month 
     { 
      tomorrow.day=1; 
      tomorrow.month=today.month+1; 
      tomorrow.year=today.year%100; 
     } 
    } 
    else 
    { 
     tomorrow.day=today.day+1; 
     tomorrow.month=today.month; 
     tomorrow.year=today.year;  
    } 
    printf("\nTomorrow's date is:"); 
    printf("%i/%i/%i\n",tomorrow.month,tomorrow.day,tomorrow.year); 
    return 0; 
} 

// A function to find how many days in a month, considering the leap year 
int numberofdays(struct date d) 
{ 
    int days; 
    bool isleapyear(struct date d); 
    int day[12]= 
    {31,28,31,30,31,30,31,31,30,31,30,31}; 
    if(d.month==2&&isleapyear(d)==true) 
    { 
     days=29; 
     return days; 
    } 
    else 
    { 
     days = day[d.month-1]; 
     return days; 
    } 
} 

//a fuction to test whether it is a leapyear or not 
bool isleapyear(struct date d) 
{ 
    bool flag; 
    if(d.year%100==0) 
    { 
     if(d.year%400==0) 
     { 
      flag=true; 
      return flag; 
     } 
     else 
     { 
      flag=false; 
      return flag; 
     } 
    } 
    else 
    { 
     if(d.year%4==0) 
     { 
      flag=true; 
      return flag; 
     } 
     else 
     { 
      flag=false; 
      return flag; 
     } 
    } 
} 

Answer 1

你有使用%d %d %d以十進制格式掃描輸入，因爲如果您指定%i格式說明符，則它將從八進制格式的標準輸入中處理輸入，前提是您指定0。注意！

編輯：我建議你閱讀文檔scanf()。 here

從這個鏈接，一個重要的線如何scanf()作品與i轉換說明是：

匹配是一個符號整數。下一個指針必須是一個指向int的指針。如果以0x或0X開始，則以16爲基數讀取整數;如果以0開頭，則以8爲基數讀取整數;否則以基數10讀取。只使用對應於基地的字符。