I want to input elements of a variable-length array in a single line in C

Asked Apr 24 '23 at 04:27

Active Apr 24 '23 at 04:27

Viewed 21 times

so I want to run a for loop with scanf() to read the elements of an array in one line. But the problem is that scanf() keeps going to the next line. I want to get around this. Also, I cannot just write scanf("%d%d%d...%d", &x1, ..., &xn) because the length of array is variable and must also be input from the user.

I tried searching on the internet, but to no avail. I briefly considered the y[i]=getchar() function, only to immediately realize that getchar() is the epitome of new line commands.

asked Apr 24 '23 at 04:27

insipidintegrator

`scanf("%d", &array[i])` in a loop should work. It won't go to the next line. – Barmar Apr 24 '23 at 04:30
2

Read a full line with `fgets` and parse with `sscanf`. – Retired Ninja Apr 24 '23 at 04:32
@RetiredNinja That's hard to do with a variable number of items, since each call to `sscanf()` will start from the beginning of the string. – Barmar Apr 24 '23 at 04:32
Please show what you tried. – Barmar Apr 24 '23 at 04:33
... you could use %n to figure out how much you read. If you have a max elements read all n at a time and figure out from the return value how many you got. – Allan Wind Apr 24 '23 at 04:44
I've closed this as a duplicate of "How to use `sscanf()` in a loop?" as that allows you to process the elements of a single line read by `fgets()` or POSIX `getline()`. – Jonathan Leffler Apr 24 '23 at 04:45
@Barmar Not so hard, just need to keep moving along the string. https://godbolt.org/z/dGxMevE19 – Retired Ninja Apr 24 '23 at 04:52
@RetiredNinja `%n` is a relatively advanced `sscanf` feature. – Barmar Apr 24 '23 at 04:53
@Barmar Can't keep the training wheels on forever. – Retired Ninja Apr 24 '23 at 04:55

I want to input elements of a variable-length array in a single line in C

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