View Compilation Error

0_0_16900917_711.c:3:1: error: unknown type name 'using'
 using namespace std;
 ^
0_0_16900917_711.c:3:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
 using namespace std;
                 ^
0_0_16900917_711.c: In function 'main':
0_0_16900917_711.c:12:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i <= root; ++i)
   ^
0_0_16900917_711.c:12:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code