scanf讀取字符

Let suppose, we want to read time in HH:MM:SS format and store in the variables hours, minutes and seconds, in that case we need to skip columns (:) from the input values.

假設，我們要讀取HH：MM：SS格式的時間 ，并將其存儲在小時 ， 分鐘和秒的變量中，在這種情況下，我們需要從輸入值中跳過列(:)。

There are two ways to skip characters:

有兩種跳過字符的方法：

1. Skip any character using %*c in scanf

   在scanf中使用％* c跳過任何字符

2. And, by specifying the characters to be skipped

   并且，通過指定要跳過的字符

1)在scanf中使用％* c跳過任何字符 (1) Skip any character using %*c in scanf)

%*c skips a character from the input. For example, We used %d%*c%d and the Input is 10:20 – : will be skipped, it will also skip any character.

％* c跳過輸入中的字符。 例如，我們使用％d％* c％d ，并且Input is 10:20 – ：將被跳過，也將跳過任何字符。

Example:

例：

    Input 
Enter time in HH:MM:SS format 12:12:10
Output:
Time is: hours 12, minutes 12 and seconds 10

Program:

程序：

#include <stdio.h>
int main () 
{
int hh, mm, ss;
//input time
printf("Enter time in HH:MM:SS format: ");
scanf("%d%*c%d%*c%d", &hh, &mm, &ss) ;
//print 
printf("Time is: hours %d, minutes %d and seconds %d\n" ,hh, mm, ss) ;
return 0;
}

Output

輸出量

Enter time in HH:MM:SS format: 12:12:10
Time is: hours 12, minutes 12 and seconds 10

2)通過指定要跳過的字符 (2) By specifying the characters to be skipped)

We can specify the character that are going to be used in the input, for example input is 12:12:10 then the character : can be specified within the scanf() like, %d:%d:%d.

我們可以指定將在輸入中使用的字符，例如，輸入為12:12:10，則可以在scanf()中指定字符：，如％d：％d：％d 。

Example:

例：

    Input 
Enter time in HH:MM:SS format 12:12:10
Output:
Time is: hours 12, minutes 12 and seconds 10

Program:

程序：

#include <stdio.h>
int main () 
{
int hh, mm, ss;
//input time
printf("Enter time in HH:MM:SS format: ");
scanf("%d:%d:%d", &hh, &mm, &ss) ;
//print 
printf("Time is: hours %d, minutes %d and seconds %d\n" ,hh, mm, ss) ;
return 0;
}

Output

輸出量

Enter time in HH:MM:SS format: 12:12:10
Time is: hours 12, minutes 12 and seconds 10

翻譯自: https://www.includehelp.com/c/skip-characters-while-reading-integers-using-scanf.aspx

scanf讀取字符