Generating random number using library functions

[Laquan]

please someone can help me in writing a random number generator function. generates number between 1 to 10000 with explanation.
what is the existence of srand function and time function and how it makes enable to generate random numbers. How can I perform seeding of numbers in the process of generating random numbers.I wanted to know about the Random functions with time seed.

[Praetor]

I think, if I will go for random number generation function it can take a large space in the part of codes in the program and program code would be so large. so we need to use time as a seed.
I am going to expand a lot of my strategy but try to compile it and use your own logic to edit it how much you can.


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>


int main()

{

int rdom, sd, time;
sd = (int) time(NULL);
rdom = rand(sd);
printf("random number = %d\n", rdom);
return (0);

}

[Katty]

You can generate random numbers between a specific range and it will be happen through the rand function that is stored in the stdlib header file.
However it is little bit difficult to construct in C++ .

Code for generating random number:


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

int generate(int,int);

main()

{

srand(time(0));

int Minvalue, Maxvalue;

int num=generate(Minvalue,Maxvalue);

Printf ("The generated number is : ",num);

getch();

}

// Function coding below.............................

int generate(int Minvalue,int Maxvalue)

{

int num=(Minvalue+rand())%Maxvalue;

return num;

}

[kelfro]

If you will produce random numbers between a specified range.It's not a best way but you can say it is very simple to construct.
I am going to construct a program which will generate 20 random numbers between 1 to 10. I will make it using both functions rand and srand.


#include <cstdlib>
#include <ctime>
#include <iostream>

using namespace std;

int main()

{

srand((unsigned)time(0));

int rdom_int;

for(int indx=0; indx<20; indx++)

{

rdom_int = (rand()%10)+1;

cout << rdom_int << endl;

}

}