View Compilation Error

0_0_33117349_17006.c: In function 'main':
0_0_33117349_17006.c:6:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for(int i=1;chr[i]!='\0';i++){
  ^
0_0_33117349_17006.c:6:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_33117349_17006.c:10:10: error: redefinition of 'i'
  for(int i=0;chr[i]!='\0';i++){
          ^
0_0_33117349_17006.c:6:10: note: previous definition of 'i' was here
  for(int i=1;chr[i]!='\0';i++){
          ^
0_0_33117349_17006.c:10:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for(int i=0;chr[i]!='\0';i++){
  ^