scanf 輸入十六進(jìn)制

Here, we have to declare an unsigned int variable and input a value in hexadecimal format.

在這里，我們必須聲明一個(gè)無符號(hào)的int變量，并以十六進(jìn)制格式輸入一個(gè)值。

To input a value in hexadecimal format – we use "%x" or "%X" format specifier and to print the value in hexadecimal format – we use same format specifier "%x" or "%X".

要以十六進(jìn)制格式輸入值-我們使用“％x”或“％X”格式說明符并以十六進(jìn)制格式打印值-我們使用相同格式的說明符“％x”或“％X” 。

• "%x" – prints value with lowercase alphabets (a to f)

  “％x” –用小寫字母(a至f)打印值

• "%X" – prints value with uppercase alphabets (A to F)

  “％X” –用大寫字母(A到F)打印值

Note: In scanf(), you can use both of the format specifiers "%x" or "%X" – it does not affect to user input, but in the printf() – "%x" or "%X" matters for printing alphabets in hexadecimal value (a to f or A to F).

注意：在scanf()中 ，可以同時(shí)使用格式說明符“％x”或“％X” –它不會(huì)影響用戶輸入，但是在printf()中 – “％x”或“％X”很重要用于以十六進(jìn)制值(a到f或A到F)打印字母。

Program 1:

程序1：

#include <stdio.h>int main(void) {unsigned int value;//input "123afc"printf("Enter hexadecimal value without \"0x\": ");//using %x (small x)scanf("%x", &value);printf("value = 0x%x or 0X%X\n", value, value);//input "123AfC"printf("Enter hexadecimal value without \"0X\": ");//using X (capital x)scanf("%X", &value);printf("value = 0x%x or 0X%X\n", value, value);return 0; }

Output

輸出量

Enter hexadecimal value without "0x": 123afc value = 0x123afc or 0X123AFC Enter hexadecimal value without "0X": 123AFC value = 0x123afc or 0X123AFC .minHeight{min-height: 250px;}@media (min-width: 1025px){.minHeight{min-height: 90px;}} .minHeight{min-height: 250px;}@media (min-width: 1025px){.minHeight{min-height: 90px;}}

Program 2: Testing program with invalid hexadecimal value

程序2：測試程序的十六進(jìn)制值無效

#include <stdio.h>int main(void) {unsigned int value;//testing with invalue value //while input, we are using alphabets //which are greater than F //as we know, hexadecimal allowes only //A to F / a to f - which are equivelant//to 10 to 15printf("Enter a hexadecimal value: ");scanf("%x", &value);printf("value = %x\n", value);return 0; }

Output

輸出量

Enter a hexadecimal value: 123apd value = 123a

Explanation:

說明：

In the hexadecimal value 123apd, "p" is not a hexadecimal digit, thus, the input is valid/acceptable till valid digits. Given input 123pad is considered as 123a.

在十六進(jìn)制值123apd中 ， “ p”不是十六進(jìn)制數(shù)字，因此輸入直到有效數(shù)字都是有效/可接受的。 給定輸入123pad被視為123a 。

翻譯自: https://www.includehelp.com/c-programs/input-a-hexadecimal-value-using-scanf.aspx

scanf 輸入十六進(jìn)制

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