主控函数Cl void cal( int sel double vol bal I(void) double vol cy l ind (void double vol cone(void) switch (sel) case1: printf("球体积为:%.2f\n", vol ball() break; case2: printf("圆柱体积为:%.2f\η", vol cyl ind()); break case3: printf("圆锥体积为:%.2fⅦn", vo cone()); breakvoid cal ( int sel ) { double vol_ball(void ); double vol_cylind(void ); double vol_cone(void ); switch (sel) { case 1: printf("球体积为：%.2f\n", vol_ball( )); break; case 2: printf("圆柱体积为：%.2f\n", vol_cylind( ) ); break; case 3: printf("圆锥体积为：%.2f\n", vol_cone( ) ); break; } }