switch问题

shell

main()
{
  float a,b;
  char c;
  printf("input expression: a+(-,*,/)b \n");
  scanf("%f%c%f",&a,&b,&c);
  switch(c) {
    case '+': printf("%f\n",a+b);break;
    case '-': printf("%f\n",a-b);break;
    case '*': printf("%f\n",a*b);break;
    case '/': printf("%f\n",a/b);break;
    default: printf("input error\n");
  }
}

为什么我输入30+50出现的是input error,什么格式都错误 ?

koala114

[PHP]
#include "stdio.h"
main()
{
float a,b;
char c;
printf("input expression: a+(-,*,/)b \n");
scanf("%f%c%f",&a,&c,&b);
switch(c) {
case '+': printf("%f\n",a+b);break;
case '-': printf("%f\n",a-b);break;
case '*': printf("%f\n",a*b);break;
case '/': printf("%f\n",a/b);break;
default: printf("input error\n");
}
}

[/PHP]


[PHP]scanf("%f%c%f",&a,&c,&b); [/PHP]
[PHP]scanf("%f%c%f",&a,&b,&c); [/PHP]

macarthor

scanf参数的顺序错咯

shell

太大意了,,,真不好意思,,,麻烦你们了,谢谢