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Whats the problem with my array?

This is a discussion on Whats the problem with my array? within the C Programming forums, part of the General Programming Boards category; Wrong Output. Whats the problem with my program? Objective: Write a program in C that uses array to store the ...

  1. #1
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    Angry Whats the problem with my array?

    Wrong Output. Whats the problem with my program?

    Objective: Write a program in C that uses array to store the telephone no. of students against their roll no. Input a roll no, and then search the array for the student's telephone number.

    Code:
    #include<stdio.h>
    void main()
    {
           int arr[3][1];
           int i,j,k=100,roll;
    
           for(i=0,j=0; i<3; i++)
        {
        arr[i][j]=k;
        k++;
        }
    
        for(i=0,j=1; i<3; i++)
        {
        printf("\nEnter Phone no. Against Roll no. %d:  ", arr[i][j]);
        scanf("%d", &arr[i][j]);
        }
    
    
        printf("\nEnter Roll no. ");
        scanf("%d", &roll);
    
        for(i=0,j=0; i<3; i++)
            {
                if(roll==arr[i][j])
                {
                    for(i=0,j=1; i<3; i++)
                          printf("Phone No. %d", arr[i][j]);
                }
            }
    
    
    }

  2. #2
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    first off
    Code:
    int main(void);
    second, your code is all over,
    third, your only inputting 3 inputs, when you need to input roll number, then phone number 3 times
    fourth your output is garbled and only outputting 3 things total, need to use \n

    what you need to do in the 2d array,
    i and j = number
    0 0
    1 1
    2 2
    so you get the roll number, followed by the phone number

    i would say make a 1d array
    use i as your roll number
    and j as your phone number....

    and go from there...

  3. #3
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    plz edit the code and post for me.thanks

  4. #4
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    Quote Originally Posted by shansajid View Post
    plz edit the code and post for me.thanks
    We do VERY little of that. We help - you do your own work.
    Crossfire and loserone+_+ like this.

  5. #5
    Registered User loserone+_+'s Avatar
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    i didnt get it, what do u want to making a program,
    please explain it with another way explanation, maybe i can help u making the code,

  6. #6
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    Quote Originally Posted by loserone+_+ View Post
    i didnt get it, what do u want to making a program,
    please explain it with another way explanation, maybe i can help u making the code,
    Objective: Write a program in C that uses array to store the telephone no. of students against their roll no. Input a roll no, and then search the array for the student's telephone number.

    plz make this with your experiance.

  7. #7
    SAMARAS std10093's Avatar
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    >to store the telephone no. of students against their roll no.
    Could you give an example of that?
    Code - functions and small libraries I use


    It’s 2014 and I still use printf() for debugging.


    "Programs must be written for people to read, and only incidentally for machines to execute. " —Harold Abelson

  8. #8
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    example

    Roll no. Phone no.
    1001 +665214574
    1002 +665242344
    1003 +6634214574
    1004 +6356544534
    1005 +6432214574
    . .
    . .
    . .

  9. #9
    SAMARAS std10093's Avatar
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    Ok, so every student can be instantiated as a struct with members the Roll no, and the Phone no.
    Then create an array of students(structs).
    Then take from input a roll no. and search the array for it.
    Code - functions and small libraries I use


    It’s 2014 and I still use printf() for debugging.


    "Programs must be written for people to read, and only incidentally for machines to execute. " —Harold Abelson

  10. #10
    SAMARAS std10093's Avatar
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    Or if you don't want to use structs you could use two separates arrays, but in you mind you should always have that rollArray[0] corresponds to phoneArray[0], etc.
    Code - functions and small libraries I use


    It’s 2014 and I still use printf() for debugging.


    "Programs must be written for people to read, and only incidentally for machines to execute. " —Harold Abelson

  11. #11
    Registered User loserone+_+'s Avatar
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    Quote Originally Posted by shansajid
    example

    Roll no. Phone no.
    1001 +665214574
    1002 +665242344
    1003 +6634214574
    1004 +6356544534
    1005 +6432214574
    . .
    . .
    . .
    okay you want that
    so in this code here,
    Code:
    #include<stdio.h>
    void main()
    {
           int arr[3][1];
           int i,j,k=100,roll;
     
           for(i=0,j=0; i<3; i++)
        {
        arr[i][j]=k;
        k++;
        }
     
        for(i=0,j=1; i<3; i++)
        {
        printf("\nEnter Phone no. Against Roll no. %d:  ", arr[i][j]);
        scanf("%d", &arr[i][j]);
        }
     
     
        printf("\nEnter Roll no. ");
        scanf("%d", &roll);
     
        for(i=0,j=0; i<3; i++)
            {
                if(roll==arr[i][j])
                {
                    for(i=0,j=1; i<3; i++)
                          printf("Phone No. %d", arr[i][j]);
                }
            } 
    
    }
    what result do u want, i still didnt get it,
    is that roll hold the value of the number u giving with scanf?
    please be detailed on your questions,
    shansajid likes this.

  12. #12
    SAMARAS std10093's Avatar
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    Don't reproduce false code loserone
    Code - functions and small libraries I use


    It’s 2014 and I still use printf() for debugging.


    "Programs must be written for people to read, and only incidentally for machines to execute. " —Harold Abelson

  13. #13
    Registered User loserone+_+'s Avatar
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    Quote Originally Posted by std100093
    Don't reproduce false code loserone
    wahahaha, funny when i read thiss,,
    i didnt make the code, the code is from the thread owner
    i am asking what result he/she want to,, i still cant get it,
    std10093 u had a false read, i didnt make a false code, wahahaha :P
    Last edited by loserone+_+; 01-21-2013 at 06:49 AM.

  14. #14
    SAMARAS std10093's Avatar
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    Yes I know that

    What I want to say is that, it would be nice to fix some obvious errors and post back
    Code - functions and small libraries I use


    It’s 2014 and I still use printf() for debugging.


    "Programs must be written for people to read, and only incidentally for machines to execute. " —Harold Abelson

  15. #15
    Registered User loserone+_+'s Avatar
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    i will help,
    but i had to know what result he/she have
    what he/she expected from his giving code to his thread,

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