, :
, -, . , , .
// 0 - 0
for (i=1; i<20 &&! ( A[i-1]<0 && A[i]>0 ); i++);
break , , , ;
for (int i=0; i<20; i++){ //
if (A [ i ]<0) break; //
...}
for (int i =0; i <20 && A [ i ] >= 0){ //
...} //
, , :
// , 0
for (i =1;! (A [ i -1]==0 && A [ i ]==0); i ++)...
// , 0
for (i=1; A[i-1]!=0 || A[i]!=0; i++)...
-----------------------------------------------------------------------------------------
:
( ); , , , N ..
( , ); , .
, , , ( ++ break) ( ++ continue).
++ ( while, do while, for).
 | |||
 | |||
-----------------------------------------------------------------------------------------
:
:
( ) ;
- ;
-
;
- ;
|
|
|
- ;
(, )
( ).
: ( ) ( ) ( ).
, (), ( ). ( ) .
: x = xn (h) xk xn h xk, .. xn, xn+h, xn+2*h, , xn+k*h; :
x=xn;
x=+h; ( , ≤ xk;)
xn xn+h xn+2*h xk=xn+k*h
x=xn x+h x+h x+h
( ):
while = *2 =17.7, xn = 25.5 xk = 35.5 h = 1.0.
#define _USE_MATH_DEFINES
#include <math.h> //
#include <stdio.h> // /ࠠ
#include <conio.h> // _getch()
int main ()
{
double a = 17.7, xn = 25.5, xk = 35.5, x, y, h = 1.0;
// xn , xk
const double X _ end = xk + h/2; //
// xk
x = xn;
while (x < X_end)
{
y = a*x*x; //
printf ("x=%7.2lf y=%10.2lf\n", x, y);
x += h; //
_getch(); // ,
//
}
return 0;
}
:
x= 25.50 y= 11509.42
x= 26.50 y= 12429.82
x= 27.50 y= 13385.63
x= 28.50 y= 14376.82
x= 29.50 y= 15403.42
x= 30.50 y= 16465.42
x= 31.50 y= 17562.82
x= 32.50 y= 18695.63
x= 33.50 y= 19863.82
x= 34.50 y= 21067.42
x= 35.50 y= 22306.42
-----------------------------------------------------------------------------------------
n
= n =2, n=3:
int n = 3, a = 2;
int p = 1, k = n;
while (k > 0)
{ p *= a;
k --;
}
. :
n=3; a =2;
p=l; k=3;
// 렠 à k>0: true;
//
=1*2; k=3-l; // p=2; k=2
/*
à k>0: true; */
//
p=2*2; k=2-l; // p=4; k=l
/*
à k>0: true; */
//
=4*2; k=l-l; // p=8; k=0
/* }
à k>0: false, */
//
|
|
|
=2, n=0 :
=1; k=0;
// à k>0: false;
//
-----------------------------------------------------------------------------------------
. while :
int x, y, z;
x = y = 0;
while (y < 10) ++y; x += y; printf ("%d %d\n", x, y); //x=10, y=10
x = y = 0;
while (y < 10) x += ++y; printf ("%d %d\n", x, y); //x=55, y=10
y = 1;
while (y < 10) {x = y++; z = ++y;} printf ("%d %d %d\n", x, y, z);
//x=9, y=11, z=11
-----------------------------------------------------------------------------------------
do while = *2 =17.7, xn = 25.5 xk = 35.5 h = 1.0.
#define _USE_MATH_DEFINES
#include <math.h> //
#include <stdio.h> // /ࠠ
#include <conio.h> // _getch()
int main ()
{
double a = 17.7, xn = 25.0, xk = 35.0, x, y, h = 0.5;
const double X _ end = xk + h/2; //
// xk
x = xn;
do
{
y = a*x*x;
printf ("x=%7.2lf y=%10.2lf\n", x, y);
_getch(); // ,
//
x += h;// !!!
} while (x < X_end);
return 0;
}
-----------------------------------------------------------------------------------------
for = *2 =17.7, xn = 25.5 xk = 35.5 h = 1.0.
#define _USE_MATH_DEFINES
#include <math.h> //
#include <stdio.h> // /ࠠ
#include <conio.h> // _getch()
int main ()
{ double a = 17.7, xn = 25.5, xk = 35.0, x, y, h = 0.5;
const double X _ end = xk+h/2; //
// xk
for (x = xn; x < X_end; x+=h)
{ y = a * x * x;
printf ("x=%7.2lf y=%10.2lf\n", x, y);
_getch();
}
return 0;
}
#define _USE_MATH_DEFINES
#include <math.h> //
#include <stdio.h> // /ࠠ
|
|
|
#include <conio.h> // _getch()
int main ()
{
double a = 17.7, xn = 25.5, xk = 35.0, x, y, h = 0.5;
const double X _ beg = xn - h/2; //
// xn
for (x = xk; x > X_beg; x -= h)
{
y = a * x * x;
printf ("x=%7.2lf y=%10.2lf\n", x, y);
_getch();
}
return 0;
}
#define _USE_MATH_DEFINES
#include <math.h> //
#include <stdio.h> // /ࠠ
#include <conio.h> // _getch()
int main ()
{
double a = 17.7, x, y, h = 0.5, xn = 25.5, xk = 35.0;
const int k = int((xk-xn)/h)+1; // floor ((xk-xn)/h)+1;
x = xn;
for (int i=1; i<=k; i++)
{
y = a * x * x;
printf ("x=%7.2lf y=%10.2lf\n", x, y);
x += h;
_getch();
}
return 0;
}
-----------------------------------------------------------------------------------------
, . , .
- , , .
