View Compilation Error

0_0_31587374_4444.c: In function 'try':
0_0_31587374_4444.c:31:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for (int m = 1;m <=12;m++){
  ^
0_0_31587374_4444.c:31:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_31587374_4444.c:36:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int d = 1;d <= mdays;d++){
   ^
0_0_31587374_4444.c: In function 'main':
0_0_31587374_4444.c:63:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for (int i = 0;i < T;i++) {
  ^