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#include <stdio.h>
int main(void) {
 
int period(int* seq, int len)
{
	char seq[10] = {0, 1, 0, 1, 0, 1, 0, 1, 0, 1};
	printf ("Please, write ten elements of this massive.");
	scanf ("%d", seq[0]);
	scanf ("%d", seq[1]);
	scanf ("%d", seq[2]);
	scanf ("%d", seq[3]);
	scanf ("%d", seq[4]);
	scanf ("%d", seq[5]);
	scanf ("%d", seq[6]);
	scanf ("%d", seq[7]);
	scanf ("%d", seq[8]);
	scanf ("%d", seq[9]);
	len = 10;
    int i, k;
    for (k = 1; k <= len / 2; k++)
        if (len % k == 0)
        {
            for (i = k; i < len; i++)
                if (seq[i] != seq[i%k])
                    break;
            if (i == len)
                return k;
        }
    return 0;
}
printf ("The period of this massive is %d", period);
}
 

prog.c: In function 'period':
prog.c:6:7: error: 'seq' redeclared as different kind of symbol
  char seq[10] = {0, 1, 0, 1, 0, 1, 0, 1, 0, 1};
       ^
prog.c:4:17: note: previous definition of 'seq' was here
 int period(int* seq, int len)
                 ^
prog.c:8:2: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf ("%d", seq[0]);
  ^
prog.c:9:2: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf ("%d", seq[1]);
  ^
prog.c:10:2: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf ("%d", seq[2]);
  ^
prog.c:11:2: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf ("%d", seq[3]);
  ^
prog.c:12:2: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf ("%d", seq[4]);
  ^
prog.c:13:2: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf ("%d", seq[5]);
  ^
prog.c:14:2: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf ("%d", seq[6]);
  ^
prog.c:15:2: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf ("%d", seq[7]);
  ^
prog.c:16:2: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf ("%d", seq[8]);
  ^
prog.c:17:2: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf ("%d", seq[9]);
  ^
prog.c: In function 'main':
prog.c:31:1: warning: format '%d' expects argument of type 'int', but argument 2 has type 'int (*)(int *, int)' [-Wformat=]
 printf ("The period of this massive is %d", period);
 ^
prog.c:32:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty