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| #include <iostream>
#include <ctime>
#include <cstdlib>
#include <stdio.h>
using namespace std;
int neeew(int *a, int *b)
{
FILE *f;
f=fopen("D:\\test.dat", "wb");
for(int i = 0; i<10; ++i)
{
i=-10+rand()%10;
cout << a[i] <<' ';
}
for(int j = 0; j<10; ++j)
{
j=rand()%10+1;
cout << b[j] <<' ';
}
cout << endl;
fclose(f);
return 0;
}
int sliced(int *a, int *b)
{
int sliced_length=20;
int *sliced=new int[sliced_length];
int i,j;
for( i=0;i<10; i++)
{
sliced[i]=a[i];
}
for(j=0;i<10;i++,j++)
{
sliced[i]=b[j];
}
printf("Sliced array: ");
for(i=0;i<sliced_length-1;i++)
{
printf("%i, ",sliced[i]);
}
printf("%i\n",sliced[i]);
return 0;
}
int mix_it(int m[20],FILE *f)
{
srand(time(0));
for (int i = 0; i < 20; ++i)
{
std::swap(m[i], m[std::rand() % 20]);
cout << m[i] <<' ';
fwrite(&m[i], sizeof(int), 1, f);
}
return 0;
}
int here( int *a)
{
FILE *f;
FILE *f1;
int c=0;
int d=0;
f = fopen("D:\\test.dat", "rb");
if (f)
{
f1=fopen("D:\\test1.dat", "wb");
while (fread(&a,sizeof(int), 1, f))
{
for(int i=0;i<20;i++)
{
if(a[i]>0 && c<5)
{
c++;
cout << a[i];
fwrite(&a[i], sizeof(int), 1, f1);
}
if(a[i]<0 && d<5)
{
d++;
cout << a[i];
fwrite(&a[i], sizeof(int), 1, f1);
}
}
fclose(f);
fclose(f1);
}
}
else
cout << "Error f!" << endl;
return 0;
}
int main()
{
int *a;
int *b;
int *m;
FILE *f;
neeew(a,b);
sliced(a,b);
mix_it(m,f);
here(a);
FILE *f1;
f1 = fopen("D:\\test1.dat", "rb");
if (f1)
{
int a[20];
while (fread(&a,sizeof(int), 1, f1))
cout << a[20] << ' ';
cout << endl;
fclose(f1);
}
else
cout << "Error f1!" << endl;
cin.get();
return 0;
} |
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