#include
#include
#include
#include
#include
#include
typedef struct
{
char imya[40];
char familiya[40];
char otchestvo[40];
int telefon;
int texpasport;
float pages ;
}gor;
void form(char mass[10], char *imya, char *familiya, char *otchestvo, int telefon, int texpasport)
{
file *f;
gor y;
int i;
if ((f=fopen(mass,"w"))==null) exit(1);
for (i=1; i< =3; i++)
{
cout< < "vvedite imya: ";
cin> > imya;
cout< < "vvedite familiya: ";
cin> > familiya;
cout< < "vvedite otchestvo: ";
cin> > otchestvo;
cout< < "vvedite telefon: ";
cin> > telefon;
cout< < "vvedite texpasport: ";
cin> > texpasport;
fwrite(& y,sizeof(gor),1,f);
if(ferror(f)! =null)
exit(2);
}
fclose(f);
}
void vivod(char mass[50])
{
file *f;
gor z;
if ((f=fopen(mass, "r"))==null) exit(3);
cout< < "fail: "<
while (! feof(f)) {
fread (& z,sizeof(gor),1,f);
if (! feof(f))
{
cout< < "imya: "<
cout< < "familiya: "<
cout< < "otchestvo: "<
cout< < "telefon: "<
cout< < "texpasport: "<
}
fclose(f);
}
}
void del(char fo[10], char fi[10])
{
file *f1,*f2;
gor d;
//char temp[40];
if ((f1=fopen(fi,"r"))==null) exit(4);
if ((f2=fopen(fo,"w"))==null) exit(5);
//cout < < "vvedite nazvanie na ydalenie - ";
//cin > > temp;
for (int i=0; i< 3; i++)
{
fread(& d,sizeof(gor),1,f1);
if (feof(f1)) break;
if (i> 2)
fwrite (& d,sizeof(gor),1,f2);
}
fclose(f2);
fclose(f1);
}
void dobav(char fi[10], char fo[10],char *imya, char *familiya, char *otchestvo, int telefon, int texpasport)
{
int q;
int i;
gor d;
file *f1,*f2;
char temp[40];
if ((f1=fopen(fi, "r"))==null) exit(4);
if ((f2=fopen(fo,"r+"))==null) exit(5);
cout < < "vvedite familiu, pered kotorym nuzno dobavit element: ";
cin > > temp;
for (i=0; i< 10; i++)
{
fread(& d,sizeof(gor),1,f2);
if (feof(f2)) break;
if (strcmp(d.familiya, temp)) break;
q=i;
}
for (i=0; i< 10; i++)
{
if (feof(f2)) break;
fwrite (& d,sizeof(gor),1,f2);
if (i==q-1)
{
cout< < "vvedite imya: ";
cin> > imya;
cout< < "vvedite familiya: ";
cin> > familiya;
cout< < "vvedite otchestvo: ";
cin> > otchestvo;
cout< < "vvedite telefon: ";
cin> > telefon;
cout< < "vvedite texpasport: ";
cin> > texpasport;
cout <
}
}
fclose(f2);
fclose(f1);
}
void main()
{
int n=10;
//cout < < "vvedite kol-vo zapisey: - ";
//cin> > n;
//cout <
form("f1.txt",n);
vivod("f1.txt");
del("f1.txt","f2.txt");
cout < < "posle udalenia: \n";
vivod("f2.txt");
getch();
n=1;
system("cls");
dobav ("f2.txt","f2.txt");
cout < < "posle dobavlenia: \n";
vivod ("f2.txt");
getch();
}
write ('Vvedite 2 chisla: '); readln (A, B);
if A > B then
begin
A := A/3;
B := B*2;
end;
if B > A then
begin
B := B/3;
A := A*2;
end;
writeln (A, B);
END.
ax^2 + bx + с = 0 - это длинная программа. Нужно учесть такие случаи:
1) а = 0, x = -c/b;
2) a =/=0, D=b*b-4*a*c > 0, x1 = (-b - sqrt(D)) / (2*a), x2 = (-b + sqrt(D)) / (2*a);
3) D = 0, x1 = x2 = -b / (2*a);
4) D < 0, действительных корней нет. Комплексные корни, если нужно:
x1 = -b / (2*a) - i*sqrt(-D)) / (2*a), x2 = -b / (2*a) + i*sqrt(-D)) / (2*a);
y = Abs(x-1) - тут вообще делать нечего. Подставляй разные х и вычисляй у.