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C program on arrays - Explination

This is a discussion on C program on arrays - Explination within the C Programming forums, part of the General Programming Boards category; Hey, i have a code here that scans 10 integers and prints them without they're double. If i print 1234356792 ...

  1. #1
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    C program on arrays - Explination

    Hey,
    i have a code here that scans 10 integers and prints them without they're double.
    If i print 1234356792 my output will be 12345679
    The code below shows how to do it but i need someone to explain me a loop that's there.

    Code:
    #include <stdio.h>
    
    
    int main()
    {
        int arr[10];
        int i, j, seen;
        
        printf("Enter 10 integers:\n");
        
        for (i=0; i<10 ; i++)
        {
            scanf("%d", &arr[i]);
        }
        printf("Set(array) is:");
        
        for (i=0; i<10; i++)
        {
            seen = 0;
            for (j=0; j<i; j++)           // What does that mean?
            {
                if (arr[i]==arr[j])
                {
                    seen=1;             // what the 1 means?
                    break;
                }
            }
            if(!seen)
                printf("%d", arr[i]);
        }
        printf("\n");
        return 0;
    }
    appreciate any help

  2. #2
    Registered User whiteflags's Avatar
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    I can illustrate one problem. Scanf will read for exactly what you tell it to. So. How many integers is this?

    123456789 1 2 3 4 5 6 7 8 9

    If you said anything besides 10, you're wrong.

    Code:
    for (j=0; j<i; j++)           // What does that mean?
    Does your book have a section on for loops? You should read it.

    Code:
                    seen=1;             // what the 1 means?
    True, in this later Boolean expression:
    Code:
    if(!seen)
    See also <stdbool.h>

  3. #3
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    thanks for you reply.
    for the scanf it scans 10 integers so 10 is an integer also it could scan it of course

  4. #4
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    In older C versions there was no bool type. With a conformant compiler you can write
    Code:
    #include <stdbool.h>
    //...
    bool seen = false;
    // ...
    seen = true;
    // ...
    if (seen)
    Still, 1 and 0 are very common idioms for true and false, respectively. However, note that any other other than 0 is interpreted to mean "true"

  5. #5
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    sick appreciate the help!

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