View Compilation Error

0_0_15991504_5538.c: In function 'main':
0_0_15991504_5538.c:15:1: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
 for(int i=0;i<X-Y;i++)
 ^
0_0_15991504_5538.c:15:1: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code