C, reading multiple numbers from single input line (scanf?)

Question

Hi, I'm writing an app in pure C which expects two line at input: first one, which tells how big an array of int will be, and the second, which contains values, separated by space. So, for the following input 5 1 2 3 4 99 I need to create an array containing {1,2,3,4,99}

Now, my question is - what is the fastest (yet easy ;)) way to do so? My problem is "how to read multiple numbers without looping through the whole string checking if it's space or a number" ?

Thanks m.

Answer 1

scanf() is kind of a pain in the ass. Check out strtol() for this kind of problem, it will make your life very easy.

Answer 2

int i, size;
int *v;
scanf("%d", &size);
v = malloc(size * sizeof(int));
for(i=0; i < size; i++)
    scanf("%d", &v[i]);

Remember to free(v) after you are done!

Also, if for some reason you already have the numbers in a string, you can use sscanf()