Problematic scanf function

Question

Lately I've been trying a few exercises and examples a tutorial on YouTube gave its viewers. It all worked fine until I decided to put a scanf function to get user input.

After that everything appeared to stall leaving the terminal blank and only when i terminated the application the program's output appeared. What might be going wrong? I'm using Eclipse as IDE and mingw-64 as compiler

#include <stdio.h>
#include <stdlib.h>


int sum(int* iterator, int* bound) {
   int sum = 0;

   while(iterator <= bound){
       sum += *iterator;
       iterator++;
   }
   return sum;


}
int main() {

   int at[] = { 1,2,4,6,7,-5,-3 };
   int* bound = &at[sizeof(at)/sizeof(int)-1];

   printf( "Sum of array is : %d \n" ,sum(at, bound));

   int matrix[3][3] ={{1,2,3},{4,5,6},{7,8,9}};

   for( bound = &matrix[0][0]; bound <= &matrix[2][2]; bound++){
       printf(" %d ", *bound);
   }

And the piece of code after adding the scanf function

#include <stdio.h>
#include <stdlib.h>


int sum(int* iterator, int* bound) {
   int sum = 0;

   while(iterator <= bound){
       sum += *iterator;
       iterator++;
   }
   return sum;


}
int main() {

   int at[] = { 1,2,4,6,7,-5,-3 };
   int* bound = &at[sizeof(at)/sizeof(int)-1];

   printf( "Sum of array is : %d \n" ,sum(at, bound));

   int matrix[3][3] ={{1,2,3},{4,5,6},{7,8,9}};

   for( bound = &matrix[0][0]; bound <= &matrix[2][2]; bound++){
       printf(" %d ", *bound);
   }
   int s=3;
   printf("Give a number: ");
   scanf("%d",&s);
   printf("%d", s);
  return 0;



}