View Compilation Error

0_0_25106709_26443.c: In function 'main':
0_0_25106709_26443.c:12:2: error: expected ',' or ';' before 'for'
  for(int i=1; i<=len; i++){
  ^
0_0_25106709_26443.c:12:15: error: 'i' undeclared (first use in this function)
  for(int i=1; i<=len; i++){
               ^
0_0_25106709_26443.c:12:15: note: each undeclared identifier is reported only once for each function it appears in
0_0_25106709_26443.c:12:26: error: expected ';' before ')' token
  for(int i=1; i<=len; i++){
                          ^
0_0_25106709_26443.c:12:26: error: expected statement before ')' token