//Bai 1
#include <stdio.h>
#include <conio.h>
#include <string.h>

int main(){
	char s[100];
	printf("Xin moi nhap vao chuoi: ");
	gets(s);
	int i = 0;
	int n = 0; // bien de dem so nguyen am
	int p = 0; // bien de dem so phu am
	char nguyenAm[] = {'a','i','e','o','u'}; //dung mang de tim nguyen am
	//bug: ko dem dc chu in hoa
	//Khi gia tri cuoi cung cua mang != null
	while(s[i++] != '\0') {
		//di xuong dong 21 neu s[i] la nguyen am, && doan mach nen n++ ko tang them
		for(int j = 0; j < 5; j++) if(s[i] == nguyenAm[j] && n++) goto cnt;
		//loai bo ky tu bang ASCII
		if(s[i] > 64) p++;
		cnt:;
	}
	
	printf("Chuoi '%s' co chua: %d nguyen am va %d phu am.", s, n, p);
	getch();
	return 0;
}


//Bai 2
#include <stdio.h>
#include <conio.h>
#include <string.h>

int main(){
	char userSys[] = "admin", user[100];
	int passSys = 12345, pass;
	
    printf("\nHay nhap vao ten dang nhap: ");
    gets(user); fflush(stdin);
    printf("\nHay nhap vao mat khau: ");scanf("%i", &pass);
    
    //kiem tra xem username vs password co giong voi tren userSys
	if(!strcmp(user,userSys) && pass == passSys) printf("\nDang nhap thanh cong!");
	else printf("\nThong tin hoac mat khau ban nhap vao khong khop!");
	getch();
	return 0;
}

//bai sap xep chuoi
#include <stdio.h>
#include <conio.h>
#include <string.h>

int main(){
	char s[5][20]; //mang chuoi
	int i, j; 
	
	
	for (i = 0; i < 5; i++) {
		printf("\nHay nhap vao chuoi %i: ", i+1);
		fflush(stdin);	
		gets(s[i]);
	}
	//Chay giai thuat sap xep
	for (i = 1; i < 5; i++) {
		for (j = 1; j < 5; j++) {
			//bien chu thanh chu thuong roi moi so sanh
			if (strcmp(strlwr(s[j - 1]), strlwr(s[j])) > 0){
			char temp[20];
			strcpy(temp, s[j-1]);
			strcpy(s[j-1], s[j]);
			strcpy(s[j], temp);
			}
		}
	}
	i = 0;
	while(i < 5){
		printf("\n%s",s[i++]);
	}
	return 0;
}