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View Compilation Error

0_0_13230706_4220.c: In function 'main':
0_0_13230706_4220.c:13:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int i=0;i<len_a;i++)
     ^
0_0_13230706_4220.c:13:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_13230706_4220.c:17:13: error: redefinition of 'i'
     for(int i=0;i<len_b;i++)
             ^
0_0_13230706_4220.c:13:13: note: previous definition of 'i' was here
     for(int i=0;i<len_a;i++)
             ^
0_0_13230706_4220.c:17:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int i=0;i<len_b;i++)
     ^
0_0_13230706_4220.c:25:13: error: redefinition of 'i'
     for(int i=0;i<len_max;i++)
             ^
0_0_13230706_4220.c:17:13: note: previous definition of 'i' was here
     for(int i=0;i<len_b;i++)
             ^
0_0_13230706_4220.c:25:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int i=0;i<len_max;i++)
     ^
0_0_13230706_4220.c:36:17: error: redefinition of 'i'
         for(int i=len_max-1;i>=0;i--)
                 ^
0_0_13230706_4220.c:25:13: note: previous definition of 'i' was here
     for(int i=0;i<len_max;i++)
             ^
0_0_13230706_4220.c:36:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=len_max-1;i>=0;i--)
         ^


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