View Compilation Error

0_0_17219503_28731.c: In function 'main':
0_0_17219503_28731.c:6:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for(int i=3;i<=1000;i++){
  ^
0_0_17219503_28731.c:6:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_17219503_28731.c:9:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int j=0;j<=c;j++){
   ^
0_0_17219503_28731.c:18:11: error: redefinition of 'j'
   for(int j=0;j<=c;j++){
           ^
0_0_17219503_28731.c:9:11: note: previous definition of 'j' was here
   for(int j=0;j<=c;j++){
           ^
0_0_17219503_28731.c:18:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int j=0;j<=c;j++){
   ^
0_0_17219503_28731.c:30:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=b[n];i>=0;i--){
   ^