View Compilation Error

0_0_34539865_2108.c: In function 'main':
0_0_34539865_2108.c:13:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int j=0;j<x;j++)
   ^
0_0_34539865_2108.c:13:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_34539865_2108.c:19:1: error: expected expression before '/' token
 //        printf("%d",s[a[0]]);
 ^
0_0_34539865_2108.c:20:17: error: redefinition of 'j'
         for(int j=0;j<x;j++)
                 ^
0_0_34539865_2108.c:13:11: note: previous definition of 'j' was here
   for(int j=0;j<x;j++)
           ^
0_0_34539865_2108.c:20:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int j=0;j<x;j++)
         ^