//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;
}