问一下这种题怎么下手

scanf("%d %d",&a,&b);
scanf("%5.2f,%5.2f",&x,&y);
printf("x=%5.2f,%5.2f\n",x,y);

scanf("%ld,%ld\n",&a,&b);
scanf("%5.2f,%5.2f\n",&x,&y);

主函数里括号没有void
拿编译器运行下哈哈哈哈