main()
{
float a,b,sum;
printf("put now money :a=\n");
scanf("%f\n",&a);
printf("b=/n");
sacnf("%f\n",&b);
printf("you have money:\n");
printf("%f",&sum);
}

运行以后：
put now money :a=
我输入1个数字，按回车，光标往下跳，不出现b=,是怎么回事？？