目标C中的模运算符 [英] Modulo operator in Objective C

问题描述

从用目标C编程"(Kochan)中:

From the "Programing in Objective C" (Kochan):

程序5.8提示用户输入数字，然后继续显示数字 从该数字的最右边到最左边的数字.

Program 5.8 prompts the user to enter a number and then proceeds to display the digits from that number from the rightmost to leftmost digit.

// Program to reverse the digits of a number
#import <Foundation/Foundation.h>

int main (int argc, char *argv[])

{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int number, right_digit;

NSLog (@"Enter your number.");
scanf ("%i", &number);

while ( number != 0 ) {
right_digit = number % 10;
NSLog (@"%i", right_digit);
number /= 10;
}

[pool drain];
return 0;
}

我的问题是:当用户输入1到9的单个数字时会发生什么?我找不到有关这种情况的任何材料. 编译后，程序只需继续返回那个数字即可.这是为什么? 我试图为此代码编写代码，并花了2个小时，试图为这个如果数字是个位数"问题合并循环和决策.解决方案是如此无知！

My question is: what happening when user types in single digit number- 1 to 9 ? I couldn't find any material about such case. After compilation the program just proceed with returning that single digit. Why is that? I was trying to come up with code for this task and spend literally 2 hours, trying to incorporate loops and decision making for this " if number is single digit" problem. And the solution was so ignorant!

推荐答案

取模后，模运算符将为您提供余数.如果yo有8％10，则结果为8，因为8/10为0，余数为8.如果您有38％10，则得到相同的结果，38/10为3，余数为8.

The modulo operator gives you the remainder after a division. If yo have 8 % 10 the result is 8 because 8 / 10 is 0 with a remainder of 8. You get the same result if you have 38 % 10, 38 / 10 is 3 with a remainder of 8.

模数是您通常在小学学习的第一门科目.有趣的是，大多数孩子的模数没有问题，但是当他们知道8/10为0.8时，他们对模数的理解就很困难.

edit: Modulo is what you normally learned as the first division in elemantary school. It is funny that the most children have no problem with modulo but when they learned that 8 / 10 is 0.8 they have problems understanding modulo.

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