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View Compilation Error

0_0_25166026_14668.c: In function 'main':
0_0_25166026_14668.c:21:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=0; i<3; i++){
   ^
0_0_25166026_14668.c:21:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_25166026_14668.c:30:11: error: redefinition of 'i'
   for(int i=0; i<len; i++){
           ^
0_0_25166026_14668.c:21:11: note: previous definition of 'i' was here
   for(int i=0; i<3; i++){
           ^
0_0_25166026_14668.c:30:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=0; i<len; i++){
   ^
0_0_25166026_14668.c:35:11: error: redefinition of 'i'
   for(int i = 0; i< maxt; i++){
           ^
0_0_25166026_14668.c:30:11: note: previous definition of 'i' was here
   for(int i=0; i<len; i++){
           ^
0_0_25166026_14668.c:35:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i = 0; i< maxt; i++){
   ^
0_0_25166026_14668.c:36:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int j=0; j<26; j++){
    ^


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