BÀI TOÁN NHIỀU YÊU CẦ

#include 
#include int soChuSo(int n){
    int dem=0;
    while (n>0){
        dem++;
        n=n/10;
    }
    return dem;
}
int tinhTong(int n){
    int tong=0;
    while(n>0){
        tong=tong+(n%10);
        n=n/10;
    }
    return tong;
}


int daoNguoc(int n){
    int mu = soChuSo(n)-1;
    int kq=0;
    while(n>0){
        int m = (n%10)*pow(10,mu);
        kq=kq+m;
        n =n/10;
        mu--;
    }
    return kq;
}
int main(){
    int n;
    printf("Nhap vao so nguyen n : ");
    scanf("%d",&n);
    int scs = soChuSo(n);
    printf("So chu so (%d) = %d",n,scs);
    int tcs = tinhTong(n);
    printf("\nTong cac so trong so (%d) = %d",n,tcs);
    int sdn = daoNguoc(n);
    printf("\nDao nguoc(%d) = %d",n,sdn);

    return 0;
}