33 lines
1.1 KiB
Markdown
33 lines
1.1 KiB
Markdown
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As you could see, it is pretty simple to print out some basic calculations.
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But sometimes you want do more complicated ones.
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Then it is a good idea to save parts of the calculations in so called **variables**.
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## Knowledge
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Variables are like drawers, where you can store and label your solutions, but also update and replace them.
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You then can use the name of the **variable** just like a number,
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but it holds the data of what you have put into it before.
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To declare these variables you first write the type, e.g.,
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**float** for decimals and **int** for whole numbers, then the name of the variable.
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This is needed that the computer can understand the program.
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To assign a value to a variable, you write equals and then the value or mathematical expression it should compute before it assigns the data.
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A very simple example is:
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```
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float x = 4.0;
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float y = 3.0;
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float result = x * y + 3.0;
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```
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You can also declare first what the variable is and then change it's value:
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```
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float x;
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x = 3.0; // now the value is 3.0
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x = 4.0; // now the value of x is 4.0
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```
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## Task
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Your task is to rewrite the program to compute the BMI to use variables with height and weight.
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