random matrix

[keith katthy]

HELLO ALL.

How to get a random number from this matrix?

rand( )%[ ] [ ] =and get the value?

if i use like this [ ] [ ] = it error, so what must I do?

[1][2] A[1]=3
[2][2] A[2]=6
[3][2] A[3]=11
[4][2] A[4]=18
[5][2] A[5]=27
[6][2] A[6]=38

[2][2] B[1]=2
[2][2] B[2]=9
[2][2] B[3]=28
[2][2] B[4]=65
[2][2] B[5]=126
[2][2] B[6]=217

[1][3] C[1]=2
[2][3] C[2]=5
[3][3] C[3]=10
[4][3] C[4]=17
[5][3] C[5]=26
[6][3] C[6]=37

[1][4] D[1]=3
[2][4] D[2]=24
[3][4] D[3]=81
[4][4] D[4]=192
[5][4] D[5]=375
[6][4] D[6]=648

[1][5] E[1]=2
[2][5] E[2]=5
[3][5] E[3]=10
[4][5] E[4]=17
[5][5] E[5]=26
[6][5] E[6]=37

[1][6] F[1]=4
[2][6] F[2]=7
[3][6] F[3]=12
[4][6] F[4]=19
[5][6] F[5]=28
[6][6] F[6]=39


3 2 2 3 2 4
6 9 5 24 5 7
11 28 10 81 10 12
18 65 17 192 17 19
27 126 26 375 26 28
38 217 37 648 37 39

[DumRat]

If you want to get a random number in the range [low, high), use this function.

int RandInRange(int low, int high)
{
      return (int)(rand()*(high - low))/(int)(RAND_MAX + 1);
}

Of course, you can use float, double or any other type. Or, make it a template class. Remember to use srand() before calling rand(). I guess you'd be able to use this function for your problem.

[keith katthy]

[CODE=cpp]#include <iostream>
#include <conio.h>
#include <cstdlib>
#include <math.h>
#include <stdio.h>
#include <time.h>
using namespace std;


int main()
{
void srand ( unsigned int seed );
int a[6][6] ;
int i, j;
int x[10];
int A[10], B[10], C[10], D[10], E[10], F[10];
int RandInRange(int low, int high);
int low,high;
{
for(i=1;i<7;i++ )
for(j=1;j<7;j++ )
{
for(i=1;i<7;i++ )
{
x[i]=i;
A[i]=(2+pow(x[i],2));
B[i]=(1+pow(x[i],3));
C[i]=(2+pow(x[i],2)-1);
D[i]=(3*pow(x[i],3));
E[i]=(1+pow(x[i],2));
F[i]=(3+pow(x[i],2));
}
{
printf("\n");

for(i=1;i<7; i++)

{
printf("[%d][%d] A[%d]=%d\n", i,j, i, A[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] B[%d]=%d\n", j,2, i, B[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] C[%d]=%d\n", i,3, i, C[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] D[%d]=%d\n", i,4, i, D[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] E[%d]=%d\n", i,5, i, E[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] F[%d]=%d\n", i,6, i, F[i]);
}
}
}
}
for(i=1;i<7;i++ )
{
cout<

printf("%d\t", A[i]);
printf("%d\t", B[i]);
printf("%d\t", C[i]);
printf("%d\t", D[i]);
printf("%d\t", E[i]);
printf("%d\t", F[i]);
}
_getch();

printf("\n");

return (int)(rand()*(h igh - low))/(int)(RAND_MAX + 1);
srand (1);


}

[/CODE] i have done this programming, but how to get the random number, ?

[DumRat]

You have to take the RandInRange() function outside the main function, right?

[keith katthy]

I dont understand. How to put it?

[DumRat]

Your functions and global variables have to be declared outside the main function. That's basic.

int A[10];
.......
......

int main()
{
//your code
}

[keith katthy]

How to get therandom numebr ..like I want a rand ( )% A [ ] [ ], i have an error if i done like that...an someone help me?

#include <iostream>
#include <conio.h>
#include <cstdlib>
#include <math.h>
#include <stdio.h>
#include <time.h>
using namespace std;




void srand ( unsigned int seed );
int a[10][10] ;
int i, j;
int x[10];
int A[10][10], B[10][10], C[10][10], D[10][10], E[10][10], F[10][10];

int main()
{
{
for(i=1;i<7;i++ )

{
for(i=1;i<7;i++ )
{
x[i]=i;
A[i]=(2+pow(x[i],2));
B[i]=(1+pow(x[i],3));
C[i]=(2+pow(x[i],2)-1);
D[i]=(3*pow(x[i],3));
E[i]=(1+pow(x[i],2));
F[i]=(3+pow(x[i],2));
}
{
printf("\n");

for(i=1;i<7; i++)

{
printf("[%d][%d] A[%d]=%d\n", i,1, i, A[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] B[%d]=%d\n", i,2, i, B[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] C[%d]=%d\n", i,3, i, C[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] D[%d]=%d\n", i,4, i, D[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] E[%d]=%d\n", i,5, i, E[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] F[%d]=%d\n", i,6, i, F[i]);
}
}
}
}
for(i=1;i<7;i++ )
{
cout<<endl;

printf("%d\t", A[i]);
printf("%d\t", B[i]);
printf("%d\t", C[i]);
printf("%d\t", D[i]);
printf("%d\t", E[i]);
printf("%d\t", F[i]);
}
_getch();

printf("\n");

printf("Random number: %d\n", rand() %[10][10]);
srand ( 1 );

}

ompiling...
120.cpp
C:\Documents and Settings\Admini strator\Desktop \MASTER\120.cpp (27) : error C2440: '=' : cannot convert from 'double' to 'int [10]'
There are no conversions to array types, although there are conversions to references or pointers to arrays
C:\Documents and Settings\Admini strator\Desktop \MASTER\120.cpp (28) : error C2440: '=' : cannot convert from 'double' to 'int [10]'
There are no conversions to array types, although there are conversions to references or pointers to arrays
C:\Documents and Settings\Admini strator\Desktop \MASTER\120.cpp (29) : error C2440: '=' : cannot convert from 'double' to 'int [10]'
There are no conversions to array types, although there are conversions to references or pointers to arrays
C:\Documents and Settings\Admini strator\Desktop \MASTER\120.cpp (30) : error C2440: '=' : cannot convert from 'double' to 'int [10]'
There are no conversions to array types, although there are conversions to references or pointers to arrays
C:\Documents and Settings\Admini strator\Desktop \MASTER\120.cpp (31) : error C2440: '=' : cannot convert from 'double' to 'int [10]'
There are no conversions to array types, although there are conversions to references or pointers to arrays
C:\Documents and Settings\Admini strator\Desktop \MASTER\120.cpp (32) : error C2440: '=' : cannot convert from 'double' to 'int [10]'
There are no conversions to array types, although there are conversions to references or pointers to arrays
C:\Documents and Settings\Admini strator\Desktop \MASTER\120.cpp (93) : error C2059: syntax error : '['
C:\Documents and Settings\Admini strator\Desktop \MASTER\120.cpp (96) : warning C4508: 'main' : function should return a value; 'void' return type assumed
Error executing cl.exe.

120.exe - 7 error(s), 1 warning(s)

[Meetee]

[CODE=CPP]#include <iostream>
#include <conio.h>
#include <cstdlib>
#include <math.h>
#include <stdio.h>
#include <time.h>
using namespace std;

void srand ( unsigned int seed );
int a[10][10] ;
int i, j;
int x[10];
int A[10][10], B[10][10], C[10][10], D[10][10], E[10][10], F[10][10];

int main()
{
{
for(i=1;i<7;i++ )

{
for(i=1;i<7;i++ )
{
x[i]=i;
A[i]=(2+pow(x[i],2));
B[i]=(1+pow(x[i],3));
C[i]=(2+pow(x[i],2)-1);
D[i]=(3*pow(x[i],3));
E[i]=(1+pow(x[i],2));
F[i]=(3+pow(x[i],2));
}
{
printf("\n");

for(i=1;i<7; i++)

{
printf("[%d][%d] A[%d]=%d\n", i,1, i, A[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] B[%d]=%d\n", i,2, i, B[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] C[%d]=%d\n", i,3, i, C[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] D[%d]=%d\n", i,4, i, D[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] E[%d]=%d\n", i,5, i, E[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] F[%d]=%d\n", i,6, i, F[i]);
}
}
}
}
for(i=1;i<7;i++ )
{
cout<<endl;

printf("%d\t", A[i]);
printf("%d\t", B[i]);
printf("%d\t", C[i]);
printf("%d\t", D[i]);
printf("%d\t", E[i]);
printf("%d\t", F[i]);
}
_getch();

printf("\n");

printf("Random number: %d\n", rand() %[10][10]);
srand ( 1 );

}[/CODE]


Please put code tags around your codes as per reply guidelines.

Yiu have taken variables as int type and the values you calculate and store in them are of type double. That's the reason of error "cannot convert from 'double' to 'int [10]'" Declare it as double. Aslo main is int type so it must return a value. That will eliminate the warning!

Regards

[keith katthy]

cpp

I have declaire it as double, but still error. Is it true i ldo like this?


#include <iostream>
#include <conio.h>
#include <cstdlib>
#include <math.h>
#include <stdio.h>
#include <time.h>
using namespace std;




void srand ( unsigned int seed );
int a[10][10] ;
int i, j;
int x[10];
double A[10][10], B[10][10], C[10][10], D[10][10], E[10][10], F[10][10];
int main()
{
{
for(i=1;i<7;i++ )

{
for(i=1;i<7;i++ )
{
x[i]=i;
A[i]=(2+pow(x[i],2));
B[i]=(1+pow(x[i],3));
C[i]=(2+pow(x[i],2)-1);
D[i]=(3*pow(x[i],3));
E[i]=(1+pow(x[i],2));
F[i]=(3+pow(x[i],2));
}
{
printf("\n");

for(i=1;i<7; i++)

{
printf("[%d][%d] A[%d]=%d\n", i,1, i, A[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] B[%d]=%d\n", i,2, i, B[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] C[%d]=%d\n", i,3, i, C[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] D[%d]=%d\n", i,4, i, D[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] E[%d]=%d\n", i,5, i, E[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%d][%d] F[%d]=%d\n", i,6, i, F[i]);
}
}
}
}
for(i=1;i<7;i++ )
{
cout<<endl;

printf("%d\t", A[i]);
printf("%d\t", B[i]);
printf("%d\t", C[i]);
printf("%d\t", D[i]);
printf("%d\t", E[i]);
printf("%d\t", F[i]);
}
_getch();

printf("\n");

printf("Random number: %d\n", rand() %[i][j]);
srand ( 1 );

}

[Meetee]

Don't write %d. Use %lf instead. Also refer this for datatype specifiers

http://irc.essex.ac.uk/www.iota-six.co.uk/c/c2_printf_and_scanf.asp

Regards

[keith katthy]

you mean that i must chage all i used for %d o %lf?Like that?

[keith katthy]

Its still error, even I have change from %d to %lf.

#include <iostream>
#include <conio.h>
#include <cstdlib>
#include <math.h>
#include <stdio.h>
#include <time.h>
using namespace std;




void srand ( unsigned int seed );
int a[6][6] ;
int i, j;
double x[10];
double A[10][10], B[10][10], C[10][10], D[10][10], E[10][10], F[10][10];

int main(void)
{
{
for(i=1;i<7;i++ )

{
for(i=1;i<7;i++ )
{
x[i]=i;
A[i]=(2+pow(x[i],2));
B[i]=(1+pow(x[i],3));
C[i]=(2+pow(x[i],2)-1);
D[i]=(3*pow(x[i],3));
E[i]=(1+pow(x[i],2));
F[i]=(3+pow(x[i],2));
}
{
printf("\n");

for(i=1;i<7; i++)

{
printf("[%lf][%lf] A[%lf]=%lf\n", i,1, i, A[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%lf][%lf] B[%lf]=%lf\n", i,2, i, B[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%lf][%lf] C[%lf]=%lf\n", i,3, i, C[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%lf][%lf] D[%lf]=%d\n", i,4, i, D[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%lf][%lf] E[%lf]=%lf\n", i,5, i, E[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%lf][%lf] F[%lf]=%lf\n", i,6, i, F[i]);
}
}
}
}
for(i=1;i<7;i++ )
{
cout<<endl;

printf("%lf\t", A[i]);
printf("%lf\t", B[i]);
printf("%lf\t", C[i]);
printf("%lf\t", D[i]);
printf("%lf\t", E[i]);
printf("%lf\t", F[i]);
}
_getch();

printf("\n");

printf("Random number: %lf\n", rand() %[i][j]);
srand ( 1 );

}

[Meetee]

Use CODE tags around your code:
[CODE=CPP ]..code goes here..[/CODE ] (without space between CODE and ] )

You have taken i as int type and while printf you have taken %lf for i also. Kindly check your code again. There are lots of same mistakes done.

Regards

[keith katthy]

Still error, anybody can help me?stuck..


#include <iostream>
#include <conio.h>
#include <cstdlib>
#include <math.h>
#include <stdio.h>
#include <time.h>
using namespace std;




void srand ( unsigned int seed );
int a[6][6] ;
double i, j;
double x[10];
double A[10][10], B[10][10], C[10][10], D[10][10], E[10][10], F[10][10];

double main(void)
{
{
for(i=1;i<7;i++ )

{
for(i=1;i<7;i++ )
{
x[i]=i;
A[i]=(2+pow(x[i],2));
B[i]=(1+pow(x[i],3));
C[i]=(2+pow(x[i],2)-1);
D[i]=(3*pow(x[i],3));
E[i]=(1+pow(x[i],2));
F[i]=(3+pow(x[i],2));
}
{
printf("\n");

for(i=1;i<7; i++)

{
printf("[%lf][%lf] A[%lf]=%lf\n", i,1, i, A[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%lf][%lf] B[%lf]=%lf\n", i,2, i, B[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%lf][%lf] C[%lf]=%lf\n", i,3, i, C[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%lf][%lf] D[%lf]=%d\n", i,4, i, D[i]);

}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%lf][%lf] E[%lf]=%lf\n", i,5, i, E[i]);
}
printf("\n");
for(i=1;i<7; i++)

{
printf("[%lf][%lf] F[%lf]=%lf\n", i,6, i, F[i]);
}
}
}
}
for(i=1;i<7;i++ )
{
cout<<endl;

printf("%lf\t", A[i]);
printf("%lf\t", B[i]);
printf("%lf\t", C[i]);
printf("%lf\t", D[i]);
printf("%lf\t", E[i]);
printf("%lf\t", F[i]);
}
_getch();

printf("\n");

printf("Random number: %lf\n", rand() %[i][j]);
srand ( 1 );

}