View Compilation Error

0_0_26559622_17443.c: In function 'BFS':
0_0_26559622_17443.c:24:6: error: expected expression before '/' token
     {//1
      ^
0_0_26559622_17443.c:27:6: error: expected expression before '/' token
     {//2
      ^
0_0_26559622_17443.c: In function 'main':
0_0_26559622_17443.c:77:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for (int i=1;i<=n;i++)
         ^
0_0_26559622_17443.c:77:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code