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View Compilation Error

0_0_30987884_22840.c: In function 'main':
0_0_30987884_22840.c:13:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i < len1; ++i)
   ^
0_0_30987884_22840.c:13:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_30987884_22840.c:17:12: error: redefinition of 'i'
   for (int i = 0; i < len2; i++)
            ^
0_0_30987884_22840.c:13:12: note: previous definition of 'i' was here
   for (int i = 0; i < len1; ++i)
            ^
0_0_30987884_22840.c:17:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i < len2; i++)
   ^
0_0_30987884_22840.c:21:12: error: redefinition of 'i'
   for (int i = 0; i < len; i++){
            ^
0_0_30987884_22840.c:17:12: note: previous definition of 'i' was here
   for (int i = 0; i < len2; i++)
            ^
0_0_30987884_22840.c:21:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i < len; i++){
   ^
0_0_30987884_22840.c:31:11: error: redefinition of 'i'
   for(int i=0;i<len1;i++){
           ^
0_0_30987884_22840.c:21:12: note: previous definition of 'i' was here
   for (int i = 0; i < len; i++){
            ^
0_0_30987884_22840.c:31:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=0;i<len1;i++){
   ^
0_0_30987884_22840.c:35:11: error: redefinition of 'i'
   for(int i=0;i<len2;i++){
           ^
0_0_30987884_22840.c:31:11: note: previous definition of 'i' was here
   for(int i=0;i<len1;i++){
           ^
0_0_30987884_22840.c:35:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=0;i<len2;i++){
   ^
0_0_30987884_22840.c:39:12: error: redefinition of 'i'
   for (int i = 0; i < len ; ++i){
            ^
0_0_30987884_22840.c:35:11: note: previous definition of 'i' was here
   for(int i=0;i<len2;i++){
           ^
0_0_30987884_22840.c:39:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i < len ; ++i){
   ^


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