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Sophia Bush

Random in C++

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Hello everyone, Im new in the forum, I Hope I will enjoy here. Im currently learning C++, And I want to know, The function random need to include any libary like iostream? *Sorry for my English, Im from Israel (But I was born in New York =))

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Rand always outputs the same numbers though. If you are working on a decent project, you might as well use boost::rand. Googled. The first link on the page should be it.

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rand() from cstdlib/stdlib.h only outputs the same numbers if you don't seed it with a different value for each run with srand(). For that matter the pseduo random number generators in boost::random will also produce the same numbers each time if you don't seed them properly too. Don't blame a library just because you don't know how to use it.

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You can also

#include <time.h>

then in a function

int iRandom;
srand(time(0));
iRandom = rand()%7+1;

It will roll a number between 1 and 7.

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Quote:
Original post by deathwearer
You can also

#include <time.h>

then in a function

int iRandom;
srand(time(0));
iRandom = rand()%7+1;

It will roll a number between 1 and 7.


Yup!, but I'll add that you only need to seed the random numbers once (srand only at startup)

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