假如要输入类似Cylinder这样的字符串，单用一个%c够吗，用了之后出现“too many characters in constant”这个错误，再问下，%s是用什么的，

改了之后还是不行啊，
#include<stdio.h>
#define pi 3.1415926
#include<math.h>
int main()
{
    char n;
    double a,b,c,s1,s2,s3,s4;
    while(scanf("%s",&n)!=EOF)
    {
        switch(n)
        {
        case 'Cylinder':scanf("%lf %lf",&a,&b);s1=pi*a*a*b;break;
        case 'Cuboid':scanf("%lf %lf %lf",&a,&b,&c);s2=a*b*c;break;
        case 'Cone':scanf("%lf %lf",&a,&b);s3=(pi*a*a*b)/3;break;
        case 'Ball':scanf("%lf",&a);s4=(4*pi*a*a)/3;break;
        }
        printf("%.3lf\n",s1+s2+s3+s4);
    }
    return 0;
}
就出现这个错误  too many characters in constant ，应该是说字符太长吧