ReArrange a number with ascending digits - c

I have to solve a problem where one of the important tasks is to reorder the digits of the input in ascending order and we are not allowed to use arrays and lists. I have no problem with that and my code works, but only if we do not consider leading 0, which we should in this problem. The only way I see how to do is to check digit by digit and then add then ordered by multiplying the number by 10 and adding the next digit. (1*10 = 10, 10+3= 13, we got 1 and 3 ordered) However, if we have a 0 in our number this method will not work because if I want to make 0123 with the * 10 method, I won't be able to have the 0 as the first digit never. Does anyone know how to solve this? My code is below:
int ascendingNumbers (int n) { //This function sorts the number on an ascending order
int number = n;
int sortedN = 0;
for (int i = 0; i <= 9; i++) {
int toSortNumber = number;
for (int x = 0; x <= 4; x++) {
int digit = toSortNumber % 10;
if (digit == i) {
if (digit == 0) {
sortedN==10;
}
sortedN *= 10;
sortedN += digit;
}
toSortNumber /= 10;
}
}
return sortedN;
}

Normally I don't do homework problems, but for especially awful ones I'll make an exception.
(Also I'm making an exception to my general rule not to have anything to do with these absurd "desert island" constraints, where you're stranded after a shipwreck and your C compiler's array functionality got damaged in the storm, or something.)
I assume you're allowed to call functions. In that case:
#include <stdio.h>
/* count the number of digits 'd' in 'n'. */
int countdigits(int n, int d)
{
int ret = 0;
/* do/while so consider "0" as "0", not nothing */
do {
if(n % 10 == d) ret++;
n /= 10;
} while(n > 0);
return ret;
}
int main()
{
int i, n;
printf("enter your number:\n");
scanf("%d", &n);
printf("digits: ");
for(i = 0; i < 10; i++) {
int n2 = countdigits(n, i);
int j;
for(j = 0; j < n2; j++) putchar('0' + i);
}
printf("\n");
}
This solution does not involve a function int ascendingNumbers() as you asked about. If you want to handle leading zeroes, as explained in the comments, you can't do it with a function that returns an int.

Your zero problem is solved, check it...
class Main {
public static void main(String[] args) {
int number = 24035217;
int n = number, count = 0;
int sortedN = 0;
while (n != 0) {
n = n / 10;
++count;
}
for (int i = 9; i >= 0; i--) {
int toSortNumber = number;
for (int x = 1; x <= count; x++) {
int digit = toSortNumber % 10;
// printf("\nBefore i = %d, x = %d, toSortNumber = %d, sortedN = %d, digit = %d",i,x,toSortNumber,sortedN,digit);
if (digit == i) {
sortedN *= 10;
sortedN += digit;
}
// printf("\nAfter i = %d, x = %d, toSortNumber = %d, sortedN = %d, digit = %d",i,x,toSortNumber,sortedN,digit);
toSortNumber /= 10;
}
}
System.out.print(sortedN);
}
}

Related

I want to print a series of Armstrong numbers which lie between m and n. Here m and n are the two inputs given by the user

I am trying to print the series but whenever I set the range (input given by me) above 407. I only get the output till 407. However, when I set the range below 407 it gives me the result according to the input I have given. Can anybody tell me what I'm doing wrong?
I used an online compiler (www.onlinegdb.com) to write my code.
Here is the code.
#include<stdio.h>
#include<stdlib.h>
int
main ()
{
int m, n;
printf
("Enter two numbers to find the Armstrong numbers that lie between them.\n");
scanf ("%d%d", &m, &n);
system("clear");
if(m>n)
{
m = m + n;
n = m - n;
m = m - n;
}
for (; m < n; m++)
{
int i = m + 1, r, s = 0, t;
t = i;
while (i > 0)
{
r = i % 10;
s = s + (r * r * r);
i = i / 10;
}
if (t == s)
printf ("%d ", t);
}
return 0;
}
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Try this code!!!
#include <math.h>
#include <stdio.h>
int main() {
int low, high, number, originalNumber, rem, count = 0;
double result = 0.0;
printf("Enter two numbers(intervals): ");
scanf("%d %d", &low, &high);
printf("Armstrong numbers between %d and %d are: ", low, high);
// swap numbers if high < low
if (high < low) {
high += low;
low = high - low;
high -= low;
}
// iterate number from (low + 1) to (high - 1)
// In each iteration, check if number is Armstrong
for (number = low + 1; number < high; ++number) {
originalNumber = number;
// number of digits calculation
while (originalNumber != 0) {
originalNumber /= 10;
++count;
}
originalNumber = number;
// result contains sum of nth power of individual digits
while (originalNumber != 0) {
rem = originalNumber % 10;
result += pow(rem, count);
originalNumber /= 10;
}
// check if number is equal to the sum of nth power of individual digits
if ((int)result == number) {
printf("%d ", number);
}
// resetting the values
count = 0;
result = 0;
}
return 0;
}
Try this code :
#include <stdio.h>
#include <math.h>
int main()
{
int start, end, i, temp1, temp2, remainder, n = 0, result = 0;
printf(“Enter start value and end value : “);
scanf(“%d %d”, &start, &end);
printf(“\nArmstrong numbers between %d an %d are: “, start, end);
for(i = start + 1; i < end; ++i)
{
temp2 = i;
temp1 = i;
while (temp1 != 0)
{
temp1 /= 10;
++n;
}
while (temp2 != 0)
{
remainder = temp2 % 10;
result += pow(remainder, n);
temp2 /= 10;
}
if (result == i) {
printf(“%d “, i);
}
n = 0;
result = 0;
}
printf(“\n”);
return 0;
}

C- Function that compares two four digit number arrays

I'm trying to create a function that compares two four digit numbers and
returns the number of similar digits between the two. For example, with a generated number of 4311 and the user entered 1488,
the score should return 2 (4 and 1).
If it was 4311 and the other is 1147,
the score should return three (1, 1 and 4). I don't know why it isn't giving me the right outputs, hope you can help.
int getSameDigitScore(int playerGuess, int generatedNum) {
int score = 0;
int i;
int j;
int k;
int generatedNumArray[4];
int playerGuessArray[4];
// turns playerGuess into an array
while (playerGuess > 0 ) {
i = 0;
playerGuessArray[i] = playerGuess % 10;
i++;
playerGuess /= 10;
}
// turns generatedNum into an array
while (generatedNum > 0) {
i = 0;
generatedNumArray[i] = generatedNum % 10;
i++;
generatedNum /= 10;
}
// compares the two arrays
for (k = 3; k >= 0; k--) {
for (j = 3; j >= 0; j--) {
if (generatedNumArray[k] == playerGuessArray[j]) {
score++;
playerGuessArray[j] = 0;
j = -5;
}
}
}
return score;
}
You are assigning i = 0 inside the while loop while generating the playerGuessArray and generatedNumArray. Due to which the playerGuess and generatedNumArray array will have elements as first digit of your number 0 0 0 .
Move the initialization out of the loop.
int getSameDigitScore(int playerGuess, int generatedNum) {
int score = 0;
int i, j, k, n;
int generatedNumArray[4];
int playerGuessArray[4];
// turns playerGuess into an array
i = 0; // This has been out of while loop
while (playerGuess > 0 ) {
playerGuessArray[i] = playerGuess % 10;
i++;
playerGuess /= 10;
}
// turns generatedNum into an array
int n = 0; // This has been out of the while loop
while (generatedNum > 0) {
generatedNumArray[n] = generatedNum % 10;
n++;
generatedNum /= 10;
}
// compares the two arrays
for (k = 3; k >= 0; k--) {
for (j = 3; j >= 0; j--) {
if (generatedNumArray[k] == playerGuessArray[j]) {
score++;
playerGuessArray[j] = 0;
j = -5;
}
}
}
return score;
}
int main() {
int m;
n = getSameDigitScore(1231, 2342);
printf("Score is: %d\n", m);
}
You're re-initializing increment variable i on every iteration which should be moved out of the while loop. With that moved out the above code works fine.
There are the following issues with the code.
You are initializing the integer i inside the while loop. This needs to be done before the loop for each loop.
You need a separate array to get the output of equal digits. See AnswerArray in code below. Also it is a good design practice to pass this array to the function and clear this array inside the function.
In the last for loop, you should break from the inner loop after getting a match. This is to take care of cases where playerGuess == 1222 and generatedNum = 1111 In the code shown this will result in a score of 1.
See the final code below with some test cases.
int getSameDigitScore(int playerGuess, int generatedNum, int *AnswerArray) {
int score = 0;
int i;
int j;
int k;
int generatedNumArray[4] = {0};
int playerGuessArray[4] = {0};
memset(AnswerArray,0,4*sizeof(int));
// turns playerGuess into an array
i = 0;
while (playerGuess > 0 ) {
playerGuessArray[i] = playerGuess % 10;
i++;
playerGuess /= 10;
}
// turns generatedNum into an array
i = 0;
while (generatedNum > 0) {
generatedNumArray[i] = generatedNum % 10;
i++;
generatedNum /= 10;
}
// compares the two arrays
score=0;
for (k = 3; k >= 0; k--) {
for (j = 3; j >= 0; j--) {
if (generatedNumArray[k] == playerGuessArray[j]) {
AnswerArray[score++] = generatedNumArray[k];
playerGuessArray[j] = -1;
break;
}
}
}
return score;
}
int main(void)
{
int AnswerArray[4],score;
score = getSameDigitScore(4311,1488,AnswerArray);
printf ("\nScore = %d \n Answer Array = ",score);
for (int i=0; i<score; i++)
{
printf ("%d ",AnswerArray[i]);
}
score = getSameDigitScore(4311,1147,AnswerArray);
printf ("\nScore = %d \n Answer Array = ",score);
for (int i=0; i<score; i++)
{
printf ("%d ",AnswerArray[i]);
}
score = getSameDigitScore(1222,1111,AnswerArray);
printf ("\nScore = %d \n Answer Array = ",score);
for (int i=0; i<score; i++)
{
printf ("%d ",AnswerArray[i]);
}
score = getSameDigitScore(1111,1222,AnswerArray);
printf ("\nScore = %d \n Answer Array = ",score);
for (int i=0; i<score; i++)
{
printf ("%d ",AnswerArray[i]);
}
}
The initializing i=0 which you made inside the loop should be outside the loop.
while (playerGuess > 0 ) {
i = 0;
playerGuessArray[i] = playerGuess % 10;
i++;
playerGuess /= 10;
}
If the initialization is inside the looop then,
Everytime playerGuessArray[0] value will be updated.
FYI:
If playerGuess can contain 0 aat the begin of four digit like 0123
For example, playerGuessValue is 0123, Then by using
while (playerGuess > 0 ) {
i = 0;
playerGuessArray[i] = playerGuess % 10;
i++;
playerGuess /= 10;
}
playerGuessArray will contain only [1,2,3] instead of [0,1,2,3].
So, the better solution would be taking two temporary variables and checking last digit one by one.
Like this:
int temp1=playerGuess, temp2=GeneratedNum;
int i=0;
bool flag = true;
while(flag && i < 4){
if(temp1%10 != temp2%10){
flag = false;
}
temp1 /= 10;
temp2 /= 10;
i++;
}
if(flag){
score++;
}
FYI:
Debugging will help you in finding out these little mistakes.So, try to debug your code with multiple inputs and verify your answer.
Here are few reference on how to debug:
https://blog.hartleybrody.com/debugging-code-beginner/
https://www.codementor.io/mattgoldspink/how-to-debug-code-efficiently-and-effectively-du107u9jh%60
Thanks.

How to find the nth number?

For an assignment, I have to write code which accepts as input an integer n and outputs the nth 'superunusual' number.
The first few su-numbers are: 22, 23, 26, 33, ... So when the input is 1, the output should be 22. 2 gives 23 and 3 gives 26.
I already have a code that checks if the input number is a su-number, but I can't find a way to calculate the nth number.
So when I now input 22, it says that 22 is a superunusual number.
The code:
/* calculates largest prime factor */
int lprime(int n) {
int max = -1;
while (n % 2 == 0) {
max = 2;
n /= 2;
}
for (int i = 3; i*i <= n; i += 2) {
while (n % i == 0) {
max = i;
n = n / i;
}
}
if (n > 2) {
max = n;
}
return max;
}
/* check unusual number */
int unus(int n) {
/* find largest prime of number */
int factor = lprime(n);
/* Check if largest prime > sqrt(n) */
if ((factor*factor) > n) {
return 1; /* true */
}
else {
return 0; /* false */
}
}
/* delete digit from number */
int del(int num, int n) {
int d = log10(num)+1; /* checks amount of digits */
int revnew = 0;
int new = 0;
for (int i = 0; num != 0; i++) {
int dig = num % 10;
num = num / 10;
if(i == (d - n)) {
continue;
} else {
revnew = (revnew * 10) + dig;
}
}
for (int i = 0; revnew != 0; i++) {
new = (new*10) + (revnew % 10);
revnew = revnew / 10;
}
return new;
}
/* driver code */
int main(int argc, char* v[]) {
int m=22, n;
int x = 0;
int i = 1;
int counter = 0;
scanf("%d", &n);
int d = log10(m)+1;
while (counter < n) {
if (unus(m++)) {
counter++;
}
}
for(unus(m); i < d; i++) {
int nmin = del(m, i);
if (unus(nmin)) {
continue;
} else {
printf("%d is not supurunusual\n", (m-1));
x++;
}
}
if(x==0) {
printf("%d is superunusual!\n", (m-1));
}
return 0;
}
I hope you can understand my code. Otherwise I will explain it better.
Also, I'm quite new to coding, so please don't be to harsh...
You have a function to determine whether a number is unusual, but you do the check whether a number is super-unusual in the body of the main routine. If you extract that code into a proper function:
int is_superunusual(int m)
{
int d = log10(m) + 1;
if (unus(m) == 0) return 0;
for(int i = 0; i < d; i++) { // see footnote
int nmin = del(m, i);
if (unus(nmin) == 0) return 0;
}
return 1;
}
then you can use Eugene's code:
while (counter < n) {
if (is_superunusual(m++)) {
counter++;
}
}
printf("The su number #%d is %d\n", n, m - 1);
Your code tested for unusual numbers, not super-unusual numbers.
Footnote: If you take del(num, n) to mean "remove the nth digit from the end", you can do away with the log10 call in del. You must check all deletions anyway, so the order doesn't really matter here.

Can't print out sociable numbers properly

I have a code that finds the sum of the divisors of a number, but I can't get it to apply on my increasing n and print all the numbers respectively.
The code is
long div(int n) {
long sum = 0;
int square_root = sqrt(n);
for (int i = 1; i <= square_root; i++) {
if (n % i == 0) {
sum += i;
if (i * i != n) {
sum += n / i;
}
}
}
return sum - n;
}
On my main() I need to have a c number that starts from 1 and goes to my MAXCYC which is 28. The n goes from 2 to MAXNUM which is 10000000. The program needs to find all perfect, amicable and sociable numbers and print them with their respective pairs.
Sample output:
Cycle of length 2: 12285 14595 12285
Cycle of length 5: 12496 14288 15472 14536 14264 12496
for (int n = 2; n <= MAXNUM; n++) {
long sum = div(n);
long res = div(sum);
if (res <= MAXNUM) { // Checking if the number is just sociable
int c = 0;
while (c <= MAXCYC && n != res) {
res = div(sum);
c++;
}
if (c <= MAXCYC) {
printf("Cycle of length %d: ", c);
printf("%ld ", sum);
do {
printf("%ld ", res);
res = div(res);
}
while (sum < res);
printf("%ld ", sum);
c += c - 2;
printf("\n");
}
}
}
I only get pairs of cycle length of 1, 2 and nothing above that. Also it doesn't even print it correctly since it says Cycle of length 0: in all of the results without increasing. I think the problem is in the f before the first print but I can't get it to work in a way that as long as my
(n == sum) it prints Cycle of length 1: x x pairs
(n == res && sum < res) it prints Cycle of length 2: x y x pairs
(res <= MAXNUM) it prints Cycle of length c: x y z ... x (c amount of pairs including first x)
What do you guys think I should change?
Ok, this code should work if I understood well your requirement.
#include <stdio.h>
#include <stdlib.h>
int div_sum(int n)
{
long sum = 0;
int square_root = sqrt(n);
for (int i = 1; i <= square_root; i++)
{
if (n % i == 0)
{
sum += i;
if (i * i != n)
{
sum += n / i;
}
}
}
return sum - n;
}
int MAX_N = 10000000;
int MAX_CYCLES = 28;
int main()
{
int cycles;
for(int n = 2; n < MAX_N; n++){
int found = 0;
for(int c = 1; !found && c <= MAX_CYCLES; c++){
cycles = c;
int aliquote = n;
while(cycles--) aliquote = div_sum(aliquote);
//it is a cycle of length c
cycles = c;
if(n == aliquote){
printf("Cycle of length %d: %d", c, n);
while(cycles--){
aliquote = div_sum(aliquote);
printf(" %d", aliquote);
}
printf("\n");
found = 1;
}
}
}
return 0;
}

Why this reverse function can not work in the for loop?

#include <stdio.h>
#include <math.h>
int prime (long n);
long reverse(long n);
int main(void)
{
long n;
long i, j;
puts("Enter n dight number, and we will help you find symmetrical prime number");
scanf("%ld", &n);
for (i = 11; i < (pow(10, n) - 1); i+= 2)
{
if (prime(i))
{
j = reverse(i);
if (i == j)
{
printf("%ld\n", i);
}
}
}
}
int prime (long n) //estimate whether the number n is primer number
{
int status = 0;
int j;
//1 is prime, 0 is not
if (n % 2 == 0 || n == 3)
{
if (n == 2)
status = 1;
if (n == 3)
status = 1;
else
{
n++;
status = 0;
}
}
else
{
j = 3;
while (j <= sqrt(n))
{
if (n % j == 0)
{
status = 0;
break;
}
else
status = 1;
j+= 2;
}
}
return status;
}
long reverse(long n) //reverse a number
{
int i, j, x;
long k, sum;
int digit = 0;
int ar[1000];
while (n > 0)
{
k = n;
n = n / 10;
x = (k - n*10);
digit++;
ar[digit] = x;
}
for (i = 1,j = digit - 1; i <= digit; i++, j--)
{
sum += ar[i] * pow(10, j)
}
return sum;
}
I build a reverse function in order to reverse numbers, for example, 214, to 412.
This function works fine in individual number, for instance, I type reverse(214), it return 412, which is good. But when I combine reverse() function with for loop, this function can not work... it produces some strange number...
so How can I fix this problem?
The reverse function is extremely complicated. The better way to go about it would be:
long reverse (long n)
{
long result = 0;
while (n != 0)
{
result *= 10;
result += n % 10;
n /= 10;
}
return result;
}
I think the problem in your code is that in the following segment
digit++;
ar[digit] = x;
you first increment the position then assign to it, thus leaving ar[0] unintialized.
How can I fix this problem?
You need to initialize sum
long k, sum = 0;
^
See the code from #Armen Tsirunyan for a simpler approach.

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