习题4.2

修改后

#include <stdio.h>#include <stdlib.h>int main(){    long a,b;    float x,y;    scanf("%d,%d",&a,&b);    scanf("%f,%f",&x,&y);    printf("a=%d,b=%d\n",a,b);    printf("x=%5f,y=%5f\n",x,y);}