&x,&y(1)
t=x;x=y;y=t;(2)
#include<stdio.h>
int main()
{
float a,b;
char ch;
scanf("%f%c%f",&a,&ch,&b);
switch(ch&&b!=0)
{
case '+':printf("%.2f+%.2f=%.2f",a,b,a+b);break;
case '-':printf("%.2f-%.2f=%.2f",a,b,a-b);break;
case '*':printf("%.2f*%.2f=%.2f",a,b,a*b);break;
case '/':printf("%.2f/%.2f=%.2f",a,b,a/b);break;
default :printf("除数为0");
}
return 0;
}
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