C++ question...

[CBlakeNS]

I have started with an array that defines 1000 elements.

Inside the array I need to assign the elements to have a random number between 0 and 1000.

Do you guys have any pointers in how to do so?

I really appreciate it.

 

[bassman]

I'd use the C rand() function in a for loop. There may be better ways depending on the platform you're using.

 

[CBlakeNS]

I dont understand how I would do that...

for (int i = 0; i < size; i++){
randomNumber = 1 + rand()% 1000;
}

and if that was right how would I incorporate it into the array?

 

[jakegub]

I dont understand how I would do that...

for (int i = 0; i < size; i++){
randomNumber = 1 + rand()% 1000;
}

and if that was right how would I incorporate it into the array?

If that rand() function works properly, just say

for (int i = 0; i < size; i++){
arrayName = lowerBound + (upperBound * rand());
}

in your example i think you wanted a number between 0 and 1000, so
lowerBound would be 0, upperBound would be 1000

 

[CBlakeNS]

Here is my code so far, but I cant get it to work....

//Array

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <stdlib.h>

using namespace std;

const int size = 1000;

int randomNumber;
int largestValueSoFar;

int ar[size] = {};

int main () {

for (int i = 0; i < size; i++){
ar = 1 + (1000 * rand());
}

int listMaximum(const int A[], int size){
while (size >= 1);
int largestValueSoFar = A[0];

for (int i = 1; i <size; ++i){
if (A > largestValueSoFar)
largestValueSoFar = A;
return largestValueSoFar;
}

cout << "The maximum value of the array is: " << largestValueSoFar << endl;



return 0;
}

 

[Least]

first you implement an array with 1000 elements

then you make a for loop that goes from 0 - 999.

then you call each individual array element using the variable in the for loop.

then you set the value with the rand() function.

i can't remember the syntax as i've not coded for a while, but should look sort of like this:

#include <stdlib.h>
int main(){
int array[1000];
for(int i = 0; i < 1000; i++){
array = rand() % 1000;
}
return 0;
}

...or something like that.

EDIT: oh, you want between 0 - 1000. that is rand() % 1001.

 

[CBlakeNS]

Here is my code again, it prints out the random numbers from A[702] - A[1000]: How come it wont show 0 - 1000?

//Array

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <stdlib.h>

using namespace std;

const int size = 1001;

int ar[size];

int main () {

srand((unsigned int) time(0));

for (int i = 0; i < size; i++){
ar = 1 + rand() % 1001;
}

for (int i = 0; i < size; i++){
cout << " A[" << i << "] = " << ar << endl;
}



return 0;
}

 

[mikeblas]

You've got several mistakes in your code. Perhaps you should grab a book on C++, or take a programming class.