#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX 100
//ham kien tra chuoi doi xung
int ktDoiXung(char a[]){
    for (int i = 0; i < strlen(a) / 2; i++)
    {
        if (a[i] != strlen(a ) - 1 - i)
        {
            return 0;
        }
    }  
    return 1;
}
int main(){
    system("cls");

    char chuoi[MAX];
    printf("nhap vao chuoi: ");
    gets(chuoi);

    if (ktDoiXung)
    {
        printf("La chuoi doi xung.");
    }else       
    {
        printf("Khong phai la chuoi doi xung.");
    }
    return 0;
}

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