arrays of random integers & time

This is a discussion on arrays of random integers & time within the C++ Programming forums, part of the General Programming Boards category; i am new i have two questions about functions 1.I need to know how to test my program with a ...

  1. #1
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    i am new i have two questions about functions

    1.I need to know how to test my program with a loop of 25 repetitions

    2. generate an attack location with rand() function. and pass the variable row and col by refernces

  2. #2
    and the hat of wrongness Salem's Avatar
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    What have you tried so far?

  3. #3
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    i dont have anything in the main(),i am so stumped i jus need a kick in the right direction

  4. #4
    and the hat of wrongness Salem's Avatar
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    Well a loop would be
    for ( int i = 0 ; i < 25 ; i++ )

    Picking random numbers is in the FAQ
    http://faq.cprogramming.com/cgi-bin/...&id=1043284385

    Passing by reference,
    Code:
    void foo ( int &a ) {
    }
    int main ( ) {
        int bar;
        foo( bar );
    }

  5. #5
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    thank u,but this doesnt help me pass it thru columns and rows

    THANk U,and how long did it take u to understand this

  6. #6
    Code Goddess Prelude's Avatar
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    >but this doesnt help me pass it thru columns and rows
    Sure it does. Change a to col and add another parameter exactly like it except named row:
    Code:
    void f(int& col, int& row);
    >and how long did it take u to understand this
    It doesn't matter. Everyone learns differently.
    My best code is written with the delete key.

  7. #7
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    this is what i got i am still confused:

    int main ()
    {
    srand(time(NULL));
    int a = rand();
    int row,col;
    funcrand(row,col);
    for (int i= 0 ; i< 25 ; i++ )
    row= rand();
    return 0;

  8. #8
    and the hat of wrongness Salem's Avatar
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    Code:
    #include <iostream>
    void foo ( int &a ) {
        a = 2
    }
    int main ( ) {
        int bar = 1;
        std::cout << bar;
        foo( bar );
        std::cout << bar << std::endl;
    }

  9. #9
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    doesnt it have to be random and its output is suppose to be in rows and columns and run 25 times

  10. #10
    Code Goddess Prelude's Avatar
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    >doesnt it have to be random and its output is suppose to be in rows and columns and run 25 times
    That's your job. We're helping you, not doing it for you.
    My best code is written with the delete key.

  11. #11
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    Quote Originally Posted by Prelude
    >doesnt it have to be random and its output is suppose to be in rows and columns and run 25 times
    That's your job. We're helping you, not doing it for you.

    i have it running numbers,but i cant get it to run 25 times look at what i have wuts wrong:

    srand( (unsigned)time( NULL) );
    for(int times=0;times==25;times++)
    int a = 1;
    int b = 2;
    for (int a = 0; a<25; a++)
    cout<<1 + rand() % 10 <<endl;
    funcrand( a,b );
    return 0;

    but right now i cant get the other column
    Last edited by krazykid18; 12-11-2004 at 05:34 PM.

  12. #12
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    Quote Originally Posted by krazykid18
    i have it running numbers,but i cant get it to run 25 times look at what i have wuts wrong:

    srand( (unsigned)time( NULL) );
    for(int times=0;times==25;times++)
    int a = 1;
    int b = 2;
    for (int a = 0; a<25; a++)
    cout<<1 + rand() % 10 <<endl;
    funcrand( a,b );
    return 0;

    but right now i cant get the other column
    for(int times=0;times<25;times++)
    ^-------The second term (times<25) is like a boolean. You want it to run as often as that returns true.
    To code is divine

  13. #13
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    Unless you only want to loop through one line, you need to put curly braces ( { } 's ) around the code you want to execute 25 times. You'd also have a problem if you had a semicolon after the for statement.

  14. #14
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    this what i got
    int main ( )
    {
    srand( (unsigned)time( NULL) );
    for (int times=0;times<25;times++)
    int a;
    int b;
    int grid[25][25];
    int random_integer;
    for (int a = 0; a<25; a++){
    for (int b = 1; b<25; b++){
    {random_integer=rand();
    cout<<1 + rand() % 10 << a << 1+ rand() % 10 << b <<endl;}
    funcrand(a,b);
    return 0;
    }

    but when i run it says unexpected end of file as its error,wut is the problem

  15. #15
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    > for (int times=0;times<25;times++) I'm going to guess that.
    To code is divine

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