打印的整数

Question

我有用户输入的日期，例如'1月10日12'表示月，日和年。如果月份是两位数字，它可以正常工作，但是如果用户输入'January 12 01'或任何数字在0前面，那么如果月份是01或'January 1 0'，我会得到'January 12 1' '如果月份是00，而不是我输入的内容。是否有某种形式的格式出错？

#include <stdio.h> 
#include <string.h> 
#include <stdlib.h> 

typedef int (*compfn)(const void*, const void*); 

struct date 
{ 
    int month; 
    int day; //The day of the month (e.g. 18) 
    int year; //The year of the date  
}; 

char* months[]= { 
    "January", "February", 
    "March", "April", 
    "May", "June", 
    "July", "August", 
    "September", "October", 
    "November", "December"}; 


int getMonth(char tempMonth[]) 
{ 
    if(strcmp(tempMonth, months[0]) == 0) return 0; 
    if(strcmp(tempMonth, months[1]) == 0) return 1; 
    if(strcmp(tempMonth, months[2]) == 0) return 2; 
    if(strcmp(tempMonth, months[3]) == 0) return 3; 
    if(strcmp(tempMonth, months[4]) == 0) return 4; 
    if(strcmp(tempMonth, months[5]) == 0) return 5; 
    if(strcmp(tempMonth, months[6]) == 0) return 6; 
    if(strcmp(tempMonth, months[7]) == 0) return 7; 
    if(strcmp(tempMonth, months[8]) == 0) return 8; 
    if(strcmp(tempMonth, months[9]) == 0) return 9; 
    if(strcmp(tempMonth, months[10]) == 0) return 10; 
    if(strcmp(tempMonth, months[11]) == 0) return 11; 
} 

int sortDates(struct date *elem1, struct date *elem2) 
{ 
    if (elem1->year < elem2->year) 
     return -1; 
    else if (elem1->year > elem2->year) 
     return 1; 


    /* here you are sure the years are equal, so go on comparing the months */ 

    if (elem1->month < elem2->month) 
     return -1; 
    else if (elem1->month > elem2->month) 
     return 1; 

    /* here you are sure the months are equal, so go on comparing the days */ 

    if (elem1->day < elem2->day) 
     return -1; 
    else if (elem1->day > elem2->day) 
     return 1; 
    else 
     return 0; 

} 

main() 
{ 
    int n; 
    int i; 
    char tempMonth[255]; //Used to store the month until checked 

    scanf("%d", &n); 

    struct date *list; 

    list = (struct date *)malloc((n * sizeof(struct date))); 

    for(i = 0; i < n; i++) 
    { 
     scanf("%s %d %d", tempMonth, &list[i].day, &list[i].year); 
     list[i].month = getMonth(tempMonth); 
    } 

    qsort(list, n, sizeof(struct date), (compfn)sortDates); 

    for(i = 0; i < n; i++) 
    { 
     printf("%s %d %d\n", months[list[i].month], list[i].day, list[i].year); 
    } 

} 

Answer 1

如果你想一直输出至少有两个数字，用零在前面，使用%02d格式字符串，而不是%d。