runtime error

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
clrscr();
long unsigned int t=0,n1,n,count=0,n3,n4,num,n2;
scanf("%lu",&n);
n1=n-1;
while(n1!=-1)
{
num=pow(2,n1);
t=t+num;
n1–;
}
n1=0;
scanf("%lu",&n2);
if(t==n2)
{
while(n1<n)
{
scanf("%lu",&n3);
n4=pow(2,n1);
if(n3!=n4)
{
count=1;
break;
}
n1++;
}
}
else
printf("\n No\n");
if(count==1)
printf("\n No\n");
else
printf("\n Yes\n");
getch();
}

Do not use the header file conio.h and functions in it. This header is available only in ANSI C/C++ (Turbo C++), not in standard C.

But, that should be giving you a compile time error.

Your main should return an integer (0, to be precise, in case of successful completion). Hence change your void main() to int main(). That should save you from getting the NZEC (Non-Zero Exit Code) runtime error.

clrscr() and getch() are functions from conio.h. They should be removed together with #include <conio.h>

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