Mark Spen

John Matthews wrote:But if you do want to count the number of lines first, a simple way is to just read a character at a time using fgetc() until you hit EOF, incrementing your line count if the character is the end-of-line '\n' character. Then, after allocating you array, use rewind() to go back to the beginning of the file and read the numbers.

No i don't store dynamically the numbers in array.So i 'll try this solution with count the lines and when this end i'll call the rewind,right??

Hello guys!I want your help if you can.I want to read numbers from a file and store it in a 2d array.My problem is that i do not know how many lines has my file each time,each line has 7 numbers.I imagine that  i should find how many lines has my file while i read the file but i don't have any idea.Can you help me please??

Thank you!

Hello!I would like to answer something about strings.I have made a hashmap which the key is a char,especially a letter and the value is two integers.Each letter corresponds in two integers.For example h thas the key 99.I want to print each phrase i give as a stirng of integers.Especially for hello i want o print it like 9987656534. To return this string of integers i have done this:  String.valueOf(a1.values()); a1 is my hashmap but my result is [99,87,65,65,34].How can fix this?
Thank you!

Campbell Ritchie wrote:Please put code tags round your submitted code; it is very difficult to read as it is.
Why are you using floats for money? Why are you using floats at all? Any floating‑point arithmetic has too much imprecision to use for money, and floats are far worse than doubles.
Stop thinking in terms of a 0.01¢ coin; it is a 1¢ coin, and then do all your arithmetic in integers so €1 counts as 100.
Your arithmetic looks very complicated. You can calculate the number of 200 coins (=2€) simply by dividing the money by 200. Similarly you can calculate the remainder with the remainder operator %. It only works reliably in integer arithmetic, and your values shouldn't be negative, so use unsigned instead of int numbers. That means you can't calculate change < 0, but have to test whether you have enough money to buy the tickets first.

Ok thank you for you advice and i really appreciate it!!

Mike Simmons wrote:Sounds like you would need to show some code of exactly what you did.

My programm wants to buy tickets.The input is the amount of tickets i want and the money which i have.
Here is my code i have to return changes in 2,1 euros and 0.5,0.2,0.1,0.05,0.01 cents when someone wants to buy a ticket

#include <stdio.h>
#include <stdlib.h>
#define ticket 0.75
#include <math.h>
int main()
{

  int amount,piliko,piliko1,piliko2,piliko3,piliko4,piliko5,piliko6;
  float money,changes,ipoloipo,ipoloipo1,ipoloipo2,ipoloipo3,ipoloipo4,ipoloipo5;
  scanf("%d%f",&amount,&money); //amount is the number of tickets
  if((amount>=1 && amount<=5) && (money>=0.75 && money<=100))
  {
   changes=money-amount*ticket;
   //printf("%f\n",changes);
   if(changes<0)
       {
           printf("Wrong input");
           return 0;
       }


   piliko=changes/2;
   ipoloipo=changes-2*piliko;

   piliko1=ipoloipo/1;
   ipoloipo1=ipoloipo-piliko1;

   piliko2=ipoloipo1/0.5;
   ipoloipo2=ipoloipo1-0.5*piliko2;

   piliko3=ipoloipo2/0.2;
   ipoloipo3=ipoloipo2-0.2*piliko3;

   piliko4=ipoloipo3/0.1;
   ipoloipo4=ipoloipo3-0.1*piliko4;


   piliko5=ipoloipo4/0.05;
   ipoloipo5=ipoloipo4-0.05*piliko5;

   piliko6=ipoloipo5/0.01;



   if(piliko!=0)
       printf("%d * 2 euros\n",piliko);
   if(piliko1!=0)
       printf("%d * 1 euros\n",piliko1);
   if(piliko2!=0)
       printf("%d * 50 cents\n",piliko2);
   if(piliko3!=0)
       printf("%d * 20 cents\n",piliko3);
   if(piliko4!=0)
       printf("%d * 10 cents\n",piliko4);
   if(piliko5!=0)
       printf("%d * 5 cents\n",piliko5);
   if(piliko6!=0)
      printf("%d * 1 cents\n",piliko6);




  }

  else
     printf("Wrong input");
   return 0;
}
My problem is when i want 1 ticket and my money is 8.9 my output is 4*2 euros,1*10 cents, 4*1 cents and the correct answer is 4*2 euros,1*10 cents,1*0.5 cents.Something wrong happen when i divide ipoloipo4 with 0.05

Hey guys!I have a question about the division between two float numbers.My result from a devision is 0.05 and when i divided with 0.05 the result is 0 and i expected to be 1.What happened exaclty??

Hello everyone!I am trying to do a programm in java using arraylist!I have made two classes Movie and Actor.My problem is that i want to use some methods to Actor class from Movie class and i do not know how to do this.Can you help me please.Help me if you can and give me your advices!!
Here is my two classes.

FIRST CLASS /** * This class represents a movie. Each movie contains a title, its duration in minutes, the number of oscars won and * the total amount spent from the production in millions. */ public class Movie {    private String title;    private int duration;    private int oscars;   private int budget;    /**     Constructor     */   public Movie(String title, int duration, int oscars, int budget) {      this.title=title;      this.duration=duration;      this.oscars=oscars;      this.budget=budget;    }    /**     * This method returns the movie's title.     */    public String getTitle() {        return title;   }    /**     * This movie returns the movie's duration.     */    public int getDuration() {        return duration; }    /**     * This method returns the total oscars the movie won.     */    public int getOscars() {        return oscars; }    /**     * This method returns the total amount spent by the production.     */    public int getBudget() {        return budget; }    /**         * This method returns the oscar index - the total budget to the number of oscars won.     * double value = (double) value     */    public double oscarIndex() {        return  (double )budget/oscars;   } } SECOND CLASS import java.util.ArrayList; /** * This class represents an actor/actress with his/her name, age and list of movies he/she participated. */ public class Actor {    private String name;    private int age;    private ArrayList<Movie> movies;    /**      Constructor     */    public Actor(String name, int age) {        this.name=name;        this.age=age;        movies= new ArrayList<>();   }    /**     * This method returns the actor's name.     */    public String getName() {        return name;    }    /**     * This method returns the actor's age.     */    public int getAge() {        return age;  }    /**     * This methods adds a movie to hir/her lists of movies.     */    public void addMovie(Movie m) {        movies.add(m);   }    /**     * This methods returns the movies the actor has participated.     */    public ArrayList<Movie> getMovies() {        return movies;    }    /**     * This method computes the total play time of the actor in long movies (>1 hour)     */ //Here i do not know how to call the variable duration from movie class,i have tried this but is wrong    public int totalActingTime(int total) {        total=0;        if(movies.getDuration()>60)            total=total+movies.getDuration();        return total;    }    /**     * This method computes the "popularity" of the actor. The popularity is the total number of movies he/she     * participated to the total number of oscar-winning movies he/she participated.     */ //here i do not know how to call the variable oscars from other class    public double popularity(double pop) {        pop=movies/    } }

Hello everyone!I have made a programm who has two functions!My 1st function calculating the character which appear most times and the character which appear less times.My 2nd reverse a string.My problem is when i upload my programm in a platform to pass some test,my programm does not run and the platform print invalid memory reference.Have you got any idea what happend exactly?Thank you!!
here is my code

void chars(char *s, char *most_seen, char *less_seen) {    char s2[20];    int i,j,count=0,count1=1,count2=0;    strcpy(s2,s);    for(i=0;i<strlen(s);i++)    {        for(j=0;j<strlen(s);j++)        {            if(s[i]==s2[j])                count2++;        }        if(count2>count1)        {            count1=count2;            *most_seen=s[i];        }        count2=0;    }     for(i=0;i<strlen(s);i++)    {        for(j=0;j<strlen(s);j++)        {            if(s[i]==s2[j])            {                count++;            }        }        if(count==1)        {            *less_seen=s[i];            break;        }    } }

char *reverse(char *s) {    int i = 0;    char s2[100];    if(*s)    {    reverse(s+1);    s2[i++] = *s;    }    return s2; } int main() {    char *s=malloc(1000*sizeof(char));    char *s2;    char mostSeen,lessSeen;    fgets(s,1000,stdin);    s[strcspn(s,"\n")] = '\0';    chars(s,&mostSeen, &lessSeen);    s2 = reverse(s);    printf("%s\n",s);    printf("%s\n",s2);    printf("%c\n%c\n",mostSeen,lessSeen);    return 0; }

Campbell Ritchie wrote:Please format your code correctly. Spaces around operators please, and declarations on their own line please. Line 4 is illegible, and the variable names are difficult to follow.
Please explain what you want to happen and what does happen, with examples to make the problem clear. Put some debugging instructions in, printing the value of the char and showing progress of the copying.
Please also put some instructions for the user; who knows what they are supposed to write?

You are right!My programm wants to give you a string ,a char and delete this char from the string.For example the string hello and the char l, my output want to be heo.Unfortunately my output is something like  this &*%$.
In line 4 made the variable n1 to find the length of my string,n2 is a counter to find how many times my char is in my string.n3 is the difference between n1 and n2 and i use it to find how many characters my string will have.
In my second loop i try to find which characters are different from the character i gave and store it in my new string.I hope understand my explanation.

Hey!I need your help again if you can!I made a function who wants to copy a string without a character! I made my function but my output is a string of symbols not a string of letters!Can you take a look in my code to find if i have a mistake?Thank you!
Here my code.
char *Delete(char *s1,char c) {    char *s2;    int n1,n2=0,n3,i,j;    n1=strlen(s1);    while(*s1!='\0')    {        if(*s1==c)            n2++;        s1++;    }    n3=n1-n2;    s2=(char *)malloc(n3*sizeof(char));    for(i=0;*s1!='\0';i++)    {        if(*s1!=c)        {           *(s2+i)=*(s1+i);        }    }    return s2; } int main() {   char s1[20],c;   scanf("%c\n",&c);   gets(s1);   printf("The new string is: %s",Delete(s1,c));    return 0; }

Thank you for your help!I fixed my programm with the things that you said me!It works!!Really thank you!!

Hello!! I have to make a function who find the three largest element of an array using pointers. I have written my code but my programm does not run and i can not find my false.Can you help me??Pointers is a unit that i hane found some difficulties so it is important for me your help!Thank you!
Here is my code:
int ThreeElement(int *p,int k) {   int i,a1[3],*max1,*max2,*max3;    *max1=*max2=*max3=*p;    for(i=1;i<k;i++)    {        if((*(p+i))>*max1)        {         *max3=*max2;         *max2=*max1;        *max1=*(p+i);        }      else if((*(p+i))>*max2)        {            *max3=*max2;           *max2=*(p+i);        }     else if((*(p+i))>*max3)            *max3=*(p+i);    }    a1[0]=*max1;    a1[1]=*max2;    a1[2]=*max3;    for(i=0;i<3;i++)    {        printf("%d\n",a1[i]);    } } int main() {     int a[6]={10, 4, 3, 50, 23, 90};   ThreeElement(a,6);    return 0; }

Hey guys!I want to store in 2d array binary numbers with 10 bits.I want to store 10.000.000 numbers but when i try this,my programm prints me the message error and programm crashes. i did not use dynamic memory.I create this array int[10.000.000][10].
Can you help how can fix the problem??

Hey everyone!I want to read integers from file and store them into an array.My only problem is that the length of the array is different each time.How can create an array which only has the integers from the file??
I have done this
int[] integers = new int[100]; int k=0; while (sc.hasNext()) {         int x = sc.nextInt();          integers[k++]=x; }
I do this and my array has the integers from file but also has a lot of zeros in others positions.

Dave Tolls wrote:The decimal format was going to be my next suggestion.
Well caught.

For the other issue, your Cores class has not overridden the toString method and so uses the default toString from Object.
You'll need to override toString if you want your println call to output something from your Cores objects.

I fixed my code and my probleb was solved!Thank you all for you help and advice!!