Can any one explain me this...? What's wrong❌

Question

#include<stdio.h>
#include<conio.h>
void main()
{
char s[11]="javatpoint";
int i=0;
int count=0;
clrscr();
while(s[i]!==NULL)
{
if(s[i]=='a'||s[i]=='e'||s[i]=='i'||s[i]=='o'||s[i]=='u')
{
count++;
}
i++;
}
printf("\n Number of Vowels=%d",count);
getch();
}

Answer 1

You are most probably using this ancient non-standard C program which is exclusively meant for old DOS based compilers ( like turbo ), and are trying to compile it using a modern compiler.

Answer 2

Maybe you want to traverse the string
replace
s[i]!==NULL to s[i]!='\0'

clrscr() to system("cls")