View Compilation Error

0_0_37279248_11739.c: In function 'main':
0_0_37279248_11739.c:12:8: error: expected ';' before 'xian'
   node xian[110];
        ^
0_0_37279248_11739.c:14:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i < n; i++) {
   ^
0_0_37279248_11739.c:14:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_37279248_11739.c:15:32: error: 'xian' undeclared (first use in this function)
    scanf_s("%lf %lf %lf %lf", &xian[i].sx, &xian[i].sy, &xian[i].ex, &xian[i].ey);
                                ^
0_0_37279248_11739.c:15:32: note: each undeclared identifier is reported only once for each function it appears in
0_0_37279248_11739.c:17:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for (int j = 0; j < i; j++) {
    ^