#include<math.h>
main()
{
float a,b;
char c;
printf("shurushuzihefuhao:");
scanf("%f%c%f",&a,&c,&b);
if (c="+")
printf("%f",a+b);
else if (c="-")
printf("%f",a-b);
else if (c="*")
printf("%f",a*b);
else if (c="/")
printf("%f",a/b);
getch();
} .