View Compilation Error

0_0_16038880_16834.c: In function 'main':
0_0_16038880_16834.c:10:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for (int n=x;n<=y;n++)
     ^
0_0_16038880_16834.c:10:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_16038880_16834.c:13:6: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
      for (int i = 2; i < sum; i++)
      ^