Stop a for loop when user is finished entering input in c

Question

First of all, thank you for the assist!

I\'m new to the C language (and programming in general) and I\'m trying to write a program wherein the user inputs data point

Answer 1

Bottom line: don't use scanf.

Use something like

char inputline[100];

i = 0;

while(fgets(inputline, sizeof(inputline), stdin) != NULL) {
    if(strncmp(inputline, "done", 4) == 0) break;
    data[i++] = atof(inputline);
}

scanf is hard enough to use even when all your inputs are the numbers you expect. If the input might be either a number or the word "done", scanf will never work. But reading a line of text, as here, is generally easier and more flexible.

P.S. You also have to worry about the possibility that the user enters more than 1048 numbers.