CODEWITHSUNDEEP
carraysrandom
Nack
Nack

Reputation: 25

Random number, whose range is an array's elements

Being new to C, I'm trying to become familiar with the random number generator. I know how to get a random number between a certain interval (Like 1 and 100), but I'm curious as to if it's possible to get a random number that's range is inside an array's elements? Would I use rand() for this? I tried searching for some answers online to this challenge, but came up short in finding a solution. An example, if I had an array:

Array[10] = {50,26,29,10,78,12,45,83,39,55};

And I wanted to create a random number that's ending value is a number in the array, how would I do this in C?

Upvotes: 1

Views: 68

Answers (3)

Alexi
Alexi

Reputation: 391

Try to get a random index.

index = rand() % 10;

A[index]  // This gets a random value in your range

Upvotes: 0

unwind
unwind

Reputation: 399793

Simply generate a random number that's an index into the array, and read out the number at that location.

const int index = rand() % (sizeof Array / sizeof *Array);
const int value = Array[index];

Note that using modulo like this doesn't give you the best random numbers, but it should work at least.

Upvotes: 2

Hatted Rooster
Hatted Rooster

Reputation: 36473

Just pick a random index and access it.

Array[rand() % 10];

Upvotes: 0

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