. . , , .
, . , , , . , , , , Exel-.
. , , .
1 / / . , / . : ?
24 , .
: 1 , 2 0 . , Out.txt 0 9. , Out.txt nArray.
| 31 |
/* */
#include <fstream.h> //
void main(void)
{
int nKey; // , :
// ,
int nArray[10]; //
//
while (nKey!= 0)
{
// : 1 , 2 0
cout << "Enter 0 for exit, 1 for write and 2 for read\n";
cin >> nKey;
int i;
if (nKey == 1) //
{
// out.txt
ofstream OutFile("out.txt");
for (i = 0; i < 10; i++)
{
OutFile << i <<"\n"; //
}
OutFile.close(); //
} else if (nKey == 2) //
{
// out.txt
ifstream InFile("out.txt");
for (i = 0; i < 10; i++)
{
// nArray
InFile >> nArray[i];
|
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//
cout << nArray[i] << '\n';
}
InFile.close(); //
}
}
}
1 , / , / , . 24 .
.
:
// out.txt
ofstream OutFile("out.txt");
for (i = 0; i < 10; i++)
{
OutFile << i <<"\n"; //
}
OutFile.close(); //
ofstream OutFile("out.txt"). , . , ("out.txt") , ofstream , OutFile ofstream. , , ofstream , , OutFile . , ofstream , int, double, char bool, .
, ofstream (output file stream) , . int nNum, nNum, ofstream OutFile OutFile. ("out.txt") .. out.txt. , . , .
cout << . 1 , , . , .
ofstream , . OutFile.close().
. 24 :
// out.txt
ifstream InFile("out.txt");
for (i = 0; i < 10; i++)
{
// nArray
InFile >> nArray[i];
//
cout << nArray[i] << '\n';
}
InFile.close(); //
ifstream (input file stream) , . InFile out.txt.
InFile >> nArray[i], .
24, .
-, , , , nArray .
-, . 10 , 11, 11- nArray .
|
|
|
, .
1. : y = x 2. [ a, b ] Δ x = (b - a)/10. . .
.
| 32 |
/* */
#include <fstream.h>
#include <math.h>
void main(void)
{
//
double dA, dB, dDeltaX;
//
cout << "Please input a, b (b > a)\n";
cin >> dA >> dB;
//
if (dB <= dA)
{
cout << "Wrong inteval\n";
return;
}
//
dDeltaX = (dB - dA)/10.;
//
ofstream OutFile("function.txt");
for (int i = 0; i <= 10; i++)
{
//
OutFile << dA + i * dDeltaX << \t << pow(dA + i * dDeltaX, 2) <<"\n";
}
//
OutFile.close();
}
function.txt:
0 0
0.2 0.04
0.4 0.16
0.6 0.36
0.8 0.64
1 1
1.2 1.44
1.4 1.96
1.6 2.56
1.8 3.24
2 4
:
. 18
2. , .
.
| 33 |
/* */
#include <fstream.h>
void main(void)
{
//
double nArray[11][2];
//
ifstream InFile("function.txt");
for (int i = 0; i <= 10; i++)
{
//
InFile >> nArray[i][0];
//
InFile >> nArray[i][1];
//
cout << nArray[i][0] << \t << nArray[i][1] << "\n";
}
//
InFile.close();
}
5
1. f (x) [ a, b ] Δ x = (b - a)/10. . 5.1. .
! , .
! 1/ a a ≠ 0.
2. , .
.
! , , .
5.1. 1
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1. . ?
2. . ?
8
: .
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:
1) .
2) .
