#include <iostream>
#include <string.h>

using namespace std;

void nhapXau(char s[100])
{
	do {
		cout<<"Nhap vao xau s: ";
		fflush(stdin);
		gets(s);
	} while (!strcmp(s, ""));
}

void demKyTu(char s[100])
{
	int chuhoa, chuthuong, chuso, i;
	chuhoa = chuthuong = chuso = i = 0;
	while (s[i] != '\0') {
		if (isupper(s[i])) chuhoa++;
		if (islower(s[i])) chuthuong++;
		if (isdigit(s[i])) chuso++;
		i++;
	}
	cout<<"Co "<<chuhoa<<" chu hoa"<<endl;
	cout<<"Co "<<chuthuong<<" chu thuong"<<endl;
	cout<<"Co "<<chuso<<" chu so"<<endl;
}

void xoaKyTu(char s[100], int k) {
	for (int i = k; i < strlen(s); i++)
		s[i] = s[i+1];
}

void chenKyTu(char s[100], char x, int k) {
	for (int i = strlen(s); i > k ; i--)
		s[i] = s[i-1];
	s[k] = x;
}

void xoaKyTu_A(char s[100]) {
	for (int i = 0; i < strlen(s); i++)
		if (s[i] == 'a') xoaKyTu(s, i);
	cout<<"\nChuoi sau khi xoa ky tu a: "<<s<<endl;
}

void demSoTu(char s[100]) {
	int tu = 0;
	bool bat_dau = true;
	for (int i = 0; i < strlen(s); i++) {
		if (s[i] != ' ') {
			if (bat_dau) {
				tu++;
				bat_dau = false;
			}
		} else {
			bat_dau = true;
		}
	}
	cout<<"So tu: "<<tu<<endl;
}

void daoNguoc(char s[100]) {
	char s1[100];
	strcpy(s1, s);
	strrev(s1);
	cout<<"\nChuoi dao nguoc la: "<<s1<<endl;
}

void inTheoDong(char s[100]) {
	bool xuong_dong = false;
	for (int i = 0; i < strlen(s); i++) {
		if (s[i] != ' ') {
			cout<<s[i];
			xuong_dong = false;
		} else {
			if (!xuong_dong) {
				cout<<endl;
				xuong_dong = true;
			}
		}
	}
}

int main()
{
	int menu;
	char s[100];
	nhapXau(s);
	cout<<"\n\t\tMENU\n"<<endl;
	cout<<"2. Dem chu thuong, chu hoa, so"<<endl;
	cout<<"3. Xoa ky tu a"<<endl;
	cout<<"4. Dem so tu"<<endl;
	cout<<"5. Dao nguoc chuoi"<<endl;
	cout<<"6. In tu theo tung dong"<<endl;
	cout<<"- Hay nhap lua chon: "; cin>>menu;
	switch (menu) {
		case 2: demKyTu(s); break;
		case 3: xoaKyTu_A(s); break;
		case 4: demSoTu(s); break;
		case 5: daoNguoc(s); break;
		case 6: inTheoDong(s); break;
		default: cout<<"Lua chon sai";
	}
	return 0;
}