**This is the C code for Quick sort algorithm, I’m facing errors if I give input for ‘n’ above a certain limit (mostly above 40). It just stops midway. **

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
void swap(int *a, int *b)
{
    int t;
    t = *a;
    *a = *b;
    *b = t;
}
int partition(int a[], int low, int high)
{
   int i,j,pivot,t;
   pivot = a[low];
   i = low;
   j = high;

   while (i<j) {
    while (a[i] < pivot) 
        i=i+1;
    while(a[j] > pivot)
        j=j-1;
    if(i<j) {
        swap(&a[i],&a[j]);
   }
   }

    swap(&pivot,&a[j]);
    return j;

}
void quicksort(int a[], int low, int high)
{
    if (low < high)
    {
        int p = partition(a, low, high);
        quicksort(a, low, p-1);
        quicksort(a, p+1, high);
    }
}

void main()
{
    int n,a[5000];
    clock_t s,e;
    printf("Enter number of elements: ");
    scanf("%d", &n); 
    printf("Before sorting:");
    for (int i = 0; i < n; i++) {
        a[i] = rand() % 100; 
        printf("%d  ",a[i]);
    }
    s = clock();
    quicksort(a, 0, n - 1);
    e = clock();
    double time_taken = (double)(e-s)/CLOCKS_PER_SEC;
    printf("Time taken to sort %d elements: %f secondsn", n, time_taken);
    printf("After sorting:");
    for(int i = 0; i < n; i++) 
        printf("%dt",a[i]);
}

I can’t figure out why isn’t this working for inputs above 40. Please can anyone solve this.
The errors I face are,

Enter number of elements: 50

Before sorting:

It would stop right there.