How to limit the number of integers inputted by the user ?

[linda7]

I'm writing a pretty simple program, but I faced a problem in limiting user input data. For example, if I have a 2D-array of a certain size and I asked the user to input the array column by column but the problem is when I run the program it mix the numbers together.
what I actually need is to delete the rest of numbers which are not part of this column so if the size=3 and the user input 1 2 3 4 5 I need the program to skip 4 & 5 and ask the user again to input the next column with different numbers so 4 & 5 will not be printed in the next column (they should be skipped). I have an idea of splitting the loops I mean Inputting the first column in a loop, then another loop for the second column, and so on, but imagine that the size is 100 it will be really long.

This is the program I'm getting a strange output !.

#include<stdio.h>
#include<stdlib.h>
#define size 3
int main(){
 
 
int a[size][size];
 
int i,j=0;
 
 
    //printf(" input  column  #%d \n",j+1);
       printf(" input  the first column \n"); 
     for(i=0;i<size;i++){
            scanf("%3d", &a[i][0]);
   if(i==size)
  scanf ("%*[^\n]"); (void) getchar ();
        }
       j++;
         printf(" input  the next column \n"); 
 
           for(i=0;i<size;i++){
            scanf("%3d", &a[i][1]);
   if(i==size)
 scanf ("%*[^\n]"); (void) getchar ();
        }
 
         printf("Matrix A is\n");
    for(i=0;i<size;i++)
    {
       for(j=0;j<size;j++) 
        printf("%d\t",a[i][j]);
        printf("\n");
    }
 
     return 0;
}