View Compilation Error

0_0_22183246_7229.c: In function 'find':
0_0_22183246_7229.c:13:1: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
 for(int i=0;i<len;i++)
 ^
0_0_22183246_7229.c:13:1: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_22183246_7229.c: In function 'main':
0_0_22183246_7229.c:36:1: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
 for(int i=0;i<len;i++)
 ^
0_0_22183246_7229.c:42:1: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
 for(int i=0;i<sum;i++)
 ^