mirror value of a number Solved

Question

Hello, I would like to write a program in C that reads a number and displays its mirror value; for example, the mirror value of the number 456 is 654.    Configuration: Windows XP / Firefox 21.0

fiddy · Accepted Answer

Thinking about it, there's an even simpler way. And in my opinion, it's the expected way if it's for an assignment.


number : integer (chosen by the user)
remainder : integer (between 0 and 9, unit)
result : the mirrored number

Request(number)

result <- 0
While number > 0 Do
 remainder <- number modulo 10
 number <- number / 10
 result <- result * 10 + remainder
EndWhile

Display(result)

I'll let you write the code ;-).

PS: the algorithm works for positive numbers, it's up to you to see if you need to adapt it for negative numbers.
Best regards,

Google is your friend.

Sugel · Answer

Houla.

This is not going to be easy.
In fact, in C, numbers are stored in binary. The numbers as we know them don't actually have any real existence.

The best way to do this is actually to store the string, which is easily reversible.

A very informative topic here:
https://stackoverflow.com/questions/784417/reversing-a-string-in-c

The method I find the funniest is this one, translated by me:

#include <string.h> // for strlen() // returns the reverse of a null-terminated string void inplace_reverse(char * str) { if (str) { char * end = str + strlen(str) - 1; // swaps the values of two given variables // XXX: fails when a and b refer to the same memory location # define XOR_SWAP(a,b) do\ {\ a ^= b;\ b ^= a;\ a ^= b;\ } while (0) // moves inward through the character string from both ends // reverses until reaching the middle. while (str < end) { XOR_SWAP(*str, *end); str++; end--; } # undef XOR_SWAP } }

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"Fear leads to anger. Anger leads to hate. And hate ... leads to suffering." - Yoda

mr_demonicon · Answer

You just need to count the number of digits (via scanf), then place each in a variable and return the order of these variables; if var1=2, var2=5, var3=9, then we will printf var3 var2 var1, etc.

--
Good luck, and don’t forget that zero risk is in your dreams.

fiddy · Answer

Hello,

It's not complicated. I'll give you a simple method (it's not the only one).

Two steps:


I store the number in a character array (scanf).
For last character to first Do
 Display character
EndDo

Regards,

Google is your friend

Mirror value of a number

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