View Compilation Error

0_0_24486401_19348.c:14:1: error: unknown type name 'bool'
 bool ok(int ii ,int now)
 ^
0_0_24486401_19348.c: In function 'ok':
0_0_24486401_19348.c:16:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int i = 1 ;i <= limit[ii][0] ;i ++)
    ^
0_0_24486401_19348.c:16:4: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code