float zc (int x){ float z; z=2*3.14*x; return z;}float mj (int y){ float m; m=3.14*y*y; return m;}
main(){ int r; float zc1,mj1; scanf("%d",&r); zc1=zc(r); mj1=mj(r); printf("zc %f\n",zc1); printf("zc %f\n",mj1); getch();}