关于if else语句的问题！

飞驰吧！少年

#include < stdio.h >
void main()
{
        char c;
        printf("input a character: \n");
        c=getchar();
        if(c<32) printf("this is a control character\n");
        else if(c>='0' && c<='9') printf("This is a digit\n");
        else if(c>='A' && c<='Z') printf("This is a capital letter\n");
        else if(c>='a' && c<='z') printf("This is a small letter\n");
        else printf("This is an other character\n");
       
}
为什么不管输入什么数字，只能显示This is a digit？