#include
    
     using namespace std;int main(){	char c;	int s=0,z=0,k=0,q=0;	while((c=getchar())!='\n'){		int x=int(c);		if(x>=48&&x<=57)s++;		else if((x>=65&&x<=90)||(x>=97&&x<=122))z++;		else if(x=32)k++;		else q++;	}	cout<<"you have input "<
     <<" numbers"<
    

上面那个代码，是我知道字符对应的ASCII码所以才那样写的。当然也可以这样写：

#include
    
     using namespace std;int main(){	char c;	int s=0,z=0,k=0,q=0;	while((c=getchar())!='\n'){		int x=int(c);		if(x>='0'&&x<='9')s++;		else if((x>='A'&&x<='Z')||(x>='a'&&x<='z'))z++;		else if(x=' ')k++;		else q++;	}	cout<<"you have input "<
     <<" numbers"<