usage of scanf inside while test condition

Question

I want to store a series of integers till i press an enter in an array.How can i implement that

Input: 1(tab space)2(tab space)3(tab space)4(tab space)enter

i tried doing this

#include<stdio.h>
main()
{
int i,j,c,d;
int a[5];
for(i=0;i<2;i++){
        j=0;
    while((d=scanf("%d",&c))==1){
         a[j]=c;
         j=j+1;
    }
 }
}

I dont know how scanf works and using scanf return value.Please explain how i can store this input if its not impossible to do so with scanf and also

2)What else can be used inside scanf along with %d ?

I have a file with 200 rows with numbers like this (NOTE: each row has varied number of values but all numbers are less than 200)

1\t2\t3\t4\t5\t
2\t3\t4\t5\t6\t7\t8\t
11\t12\t13\t
.
.
200

... so i have to store this as an adjacency list representation

Answer 1

For the first part of your question. scanf() returns number of elements successfully read but it is of no use here and you can just scan in a loop and scanf() will pick your integers in a line when you press enter.

   #include <stdio.h>

int main(void) {
    int a[5];
    int i, n;
    for(i=0;i<5;i++)
    {
       if(scanf("%d",&a[i]) != 1)
       {
          printf("Value not read correctly\n");
          break;
       }
    }
    n = i;
    for(i=0;i<n;i++)
        printf("%d\n",a[i]);
    return 0;
}

For the second question you have to do something line

1.Read a line from your file using fgets()

2.Break your line using strtok() with tab as delimiter.

3.Now convert each token to integer using atoi()

4.Now do whatever you want with the integer. i.e. create a node add your integer to the node