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View Compilation Error

0_0_26621011_4028.c: In function 'main':
0_0_26621011_4028.c:12:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i = 0; i < len; i++)
   ^
0_0_26621011_4028.c:12:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_26621011_4028.c:19:11: error: redefinition of 'i'
   for(int i = 0;i<len; i++)
           ^
0_0_26621011_4028.c:12:11: note: previous definition of 'i' was here
   for(int i = 0; i < len; i++)
           ^
0_0_26621011_4028.c:19:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i = 0;i<len; i++)
   ^
0_0_26621011_4028.c:27:17: error: redefinition of 'i'
         for(int i=0;i<len;i++) printf("%c",a[i]);
                 ^
0_0_26621011_4028.c:19:11: note: previous definition of 'i' was here
   for(int i = 0;i<len; i++)
           ^
0_0_26621011_4028.c:27:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=0;i<len;i++) printf("%c",a[i]);
         ^


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