#Arrays

42 messages · Page 1 of 1 (latest)

pure coral
# 
#include <stdio.h>

int main()
{
    int elements[100];
    int x;
    scanf("%d %d", &x, elements[100]);
    printf("%d elements: %d\n", x, elements[x]);
}

Trying to practice some arrays.
Any ideas why this isn't working as intended?

unreal willowBOT
#

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Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question use !howto ask.

pure coral
#

my main problem is the arrays isn't getting printed

#

Am i supposed to print the 1 2 3 4 5 with a loop?

woven plover
#

What are you trying to do by passing the 101st element of elements to scanf?

#

That’s

  1. out of bounds
  2. not a pointer
pure coral
#

well i'm trying to store all the inputs as an array

woven plover
#

You want the user to be able to input a variable amount of elements to an array?

pure coral
#

The first int will indicate the amount of elements

#

1 2 3 4 5 as an example will make an array of 5 elements

#

then i want to print those elements

# 
#include <stdio.h>

char printarray(char x);

int main()
{
    int elements[100];
    int x;
    scanf("%d %d", &x, elements[100]);
    printf("%d elements: %d\n", x, printarray(elements));
}

char printarray(char x)
{
    for (int i = 0; i < x; ++i)
    {
        printf("%d", elements[i]);
    }
}
#

Am i on the right track?

woven plover
#

Your print function should return void since it’s not returning anything. The argument should also be an int, not a char

#

But you’re still reading your numbers wrong. I‘m not sure how to use scanf properly, but I think you need a for loop taking each element of the array one at a time

pure coral
#

I had a better idea

# 
#include <stdio.h>

int main()
{
    int elements[100];
    int x;
    scanf("%d ", &x);
    for(int i = 0; i < x; ++i)
    {
        scanf(" %d", elements[i]); 
    }    
    
    printf("%d elements: ", x);
    
    for(int i = 0; i < x; ++i)
    {
        printf("%d ", elements[i]);
    }
    printf("\n");
}
#

I was thinking something like this

#

and within that for loop i print every element while incrementing i

woven plover
#

That would print them if you took the input correctly, yes

pure coral
#

Oh have i messed up the scanf?

woven plover
pure coral
#

OOoh i see what you mean

pure coral
#

Is i in scope of the for loop only?
Can i use i on both of my for loops?

#

or do i need a different variable

woven plover
#

You need to pass &elements[i] to scanf, since you need to pass a pointer to that element

pure coral
#

That seems to have done the trick!

#

However i'm not sure why i need "&" tho

#

i was taught by my teacher for example when i utilize strings

#

or when i scan string i don't use &

#

That doesn't apply to arrays?

woven plover
#

Strings are arrays of chars. The variable that you assign the string to is already a pointer to the first char in that array.

#

You need to pass a pointer to scanf so it can actually modify that variable‘s value. When you find an element of the array, then it will give you the actual value at that index. & returns a pointer to that value

pure coral
#

Aaah that makes sense

#

It works perfectly just as intdned

#

@woven ploverthank you so much for your help!

woven plover
#

Awesome

unreal willowBOT
#

@pure coral Has your question been resolved? If so, type !solved :)

pure coral
#

!solved