View Compilation Error

0_0_19613346_24481.c: In function 'main':
0_0_19613346_24481.c:6:3: error: expected expression before '/' token
   //printf("\n");  
   ^
0_0_19613346_24481.c:17:7: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
       for(int j=1;j<n;++j)  
       ^
0_0_19613346_24481.c:17:7: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_19613346_24481.c:19:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int z=j+1;z<n;++z)  
         ^