View Compilation Error

0_0_35308438_4142.c: In function 'main':
0_0_35308438_4142.c:20:13: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
             for(int i=0;i<l;i++)
             ^
0_0_35308438_4142.c:20:13: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code