更改多维数组中的日期格式

Question

我有一个多维数组，其中包含一些信息，在同一个数组中有一个日期，但我想更改日期的格式：

YYYY-MM-DD

到

DD-MM-YYYY

我试图使用嵌套循环访问数组的元素，但当我达到这种格式时，我感到困惑。

这是我的代码：

#include<stdio.h>
#include<string.h>
typedef struct studentStruct {
char id[10];
char name[50];
char ddmmyyyy[11];
char cityBirth[20];
}Student;
void fillStruct(Student *std, char currentStd[4][50]);
int main(){
char records[3][4][50] = {
{"17581726", "Mohammad Alabdullah", "2002-12-10", "Buriydah"},
{"55382214", "Ibrahim Alfaris", "2003-05-07", "Riyadh"},
{"62111622","Ahmad Almansor","2001-02-22","Buriydah"}
};
34
Student students[3];
for(int i=0;i<3;i++) fillStruct(&students[i], records[i]);
for (int i = 0; i < 3; i++) {
printf("Student Name: %s, ",students[i].name);
printf("Student ID: %s, ",students[i].id);
printf("DOB: %s, ",students[i].ddmmyyyy);
printf("City of DOB: %sn",students[i].cityBirth);
}
}

Answer 1

使用扫描

void changeFormat(const size_t rows, const size_t cols, const size_t chars, char (*array)[cols][chars], size_t dateindex)
{
int y,m,d;
for(size_t row = 0; row < rows; row++)
{
if(sscanf(array[row][dateindex], "%d-%d-%d", &y, &m, &d) != 3) {/* handle error */}
snprintf(array[row][dateindex], chars, "%02d-%02d-%d", d, m, y);
}
}
void printTable(const size_t rows, const size_t cols, const size_t chars, char (*array)[cols][chars])
{
for(size_t row = 0; row < rows; row++)
{
for(size_t col = 0; col < cols; col++)
{
printf("%s%s", array[row][col], (col == cols-1) ? "" : ", ");
}
printf("n");
}
}

int main(void)
{
char records[][4][50] = {
{"17581726", "Mohammad Alabdullah", "2002-12-10", "Buriydah"},
{"55382214", "Ibrahim Alfaris", "2003-05-07", "Riyadh"},
{"62111622","Ahmad Almansor","2001-02-22","Buriydah"}
};
printTable(3,4,50, records);
changeFormat(3,4,50, records, 2);
printf("--------------------n");
printTable(3,4,50, records);
}

https://godbolt.org/z/hEzzsM6YP