View Compilation Error

0_0_30801931_20567.c: In function 'main':
0_0_30801931_20567.c:8:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for(int i = 0; i < t; ++i) {
  ^
0_0_30801931_20567.c:8:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_30801931_20567.c:11:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(double j = 0; j < n; ++j) {
   ^