View Compilation Error

0_0_14997192_11058.c:2:1: error: unknown type name 'using'
 using namespace std;
 ^
0_0_14997192_11058.c:2:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
 using namespace std;
                 ^
0_0_14997192_11058.c: In function 'main':
0_0_14997192_11058.c:24:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=1;i<c;i++)
         ^
0_0_14997192_11058.c:24:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_14997192_11058.c:32:17: error: expected expression before '/' token
                 //printf("%lld %lld\n",a,b);
                 ^
0_0_14997192_11058.c:34:17: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
                 for(int j=2;j<=100;j++)
                 ^