Why can't i run this in visual studio?

Question

#include <stdio.h>
struct student
{
int roll;
float percent;
char name[20];
}
s[100], temp;
void main()
{
int i, j, n;
printf("enter the no. of students: " );
scanf_s("%d", &n);
for (i = 0; i < n; i++) {
printf("\nstudent's Roll Number: ");
scanf_s("%d", &s[i].roll);
printf("\nstudent's Name: ");
scanf_s("%s", &s[i].name);
printf("\nStudent's percentage: ");
scanf_s("%f", &s[i].percent);
}
for (i = 0; i < n; i++)
{
printf("\nROLL_NUMBER\tNAME\tPERCENTAGE\n\n\n");
printf("%d", s[i].roll);
printf("\t%s", s[i].name);
printf("\t%.1f", s[i].percent);
}
for (i = 0; i < n; i++)
{
for (j = 0; j < n - i - 1; j++)
{
if (s[j].percent < s[j + 1].percent)
{
temp = s[j];
s[j] = s[j + 1];
s[j + 1] = temp;
}
}
}
printf("In order");
printf("\nROLL_NUMBER\tNAME\tPERCENTAGE\n\n\n");
for (i = 0; i < n; i++) {
printf("%d", s[i].roll);
printf("\t%s", s[i].name);
printf("\t%.1f", s[i].percent);
}
}

Answer 1

It works but there are few mistakes. Use scanf instead of scanf_s, if you want to use scanf_s you need to insert buffer size too. That's why vs code displays an error.

read : https://www.geeksforgeeks.org/scanf-fscanf-sscanf-scanf_s-fscanf_s-sscanf_s/