22 lines
1.4 KiB
Markdown
22 lines
1.4 KiB
Markdown
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We now move away from normal math calculations and move to the topic of random numbers.
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Your task will be, to code a program, that rolls a dice and prints out the number.
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## Knowledge
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For that we need to include new functionality. To do that, we need to write: ``#include <stdlib.h>;``.
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In there are among other instructions **srand** and **rand**.
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To call these instructions you have to put open and closed parentheses behind them.
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Because computers cannot create real random numbers but instead fake randomness with complex functions, we need to set a starting point for our **random number generator**, a so called seed that changes every time we call the program.
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To do that we use the ``srand()`` instruction, which sets the seed of the random number generator. The only problem is, every time we run the program we would end up with the same result.
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To avoid this we will also include the instruction time with ``#include <time.h>`` to get the current time and pass that as the seed.
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We then can use ``rand()`` to get a random number. Because we only want numbers between 1 and 6, we have to use the modulo-operator %.
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Don't worry, if you are not familiar with the math-concept of modulo. It just gives you the remainder of a whole number division.
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So any number modulo 25 will give you a number between 0 and 24.
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## Task
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So that is all you need to know about random numbers. Now try to implement the dice program.
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