View Compilation Error

0_0_22223243_5147.c:2:3: error: unknown type name 'using'
   using namespace std;  
   ^
0_0_22223243_5147.c:2:19: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
   using namespace std;  
                   ^
0_0_22223243_5147.c: In function 'main':
0_0_22223243_5147.c:18:5: error: 'cin' undeclared (first use in this function)
     cin >> m;  
     ^
0_0_22223243_5147.c:18:5: note: each undeclared identifier is reported only once for each function it appears in