View Compilation Error

0_0_24883538_8659.cpp: In function 'int main()':
0_0_24883538_8659.cpp:29:21: error: 'scanf' was not declared in this scope
     scanf("%d",&test);  
                     ^
0_0_24883538_8659.cpp:37:41: error: 'printf' was not declared in this scope
         printf("%.2lf %.2lf\n",zx.x,zx.y);  
                                         ^