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#include <stdio.h>
int binarysearch(int a, int mass[], int n);
int main()
{
 int N,mass,S;
 printf("N:");
 scanf("%d", &N);
 printf("Elements\n");
 for (int i = 0; i < N; i++)
 scanf("%d", &mass[i]);
 printf("S: ");
 scanf("%d", &S);
 int k;
 k = binarysearch(S, mass, N);
 if (k != -1)
 {
 printf("The index of the element is %d\n", k);
 }
 else
 printf("notfound\n");
 return 0;
}
 
int binarysearch(int S, int mass[], int n)
{
 int min, max, mid;
 min = 0;
 max = n-1;
 while (min <= max)
 {
 mid = (min + max) / 2;
 if (S < mass[mid])
 max = mid - 1;
 else if (S > mass[mid])
 min = mid + 1;
 else 
 return mid;
 }
 return -1;
}

prog.m: In function ‘main’:
prog.m:9:2: error: ‘for’ loop initial declarations are only allowed in C99 or C11 mode
  for (int i = 0; i < N; i++)
  ^~~
prog.m:9:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
prog.m:10:19: error: subscripted value is neither array nor pointer nor vector
  scanf("%d", &mass[i]);
                   ^
prog.m:14:22: warning: passing argument 2 of ‘binarysearch’ makes pointer from integer without a cast [-Wint-conversion]
  k = binarysearch(S, mass, N);
                      ^~~~
prog.m:2:5: note: expected ‘int *’ but argument is of type ‘int’
 int binarysearch(int a, int mass[], int n);
     ^~~~~~~~~~~~

Standard output is empty