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C++ Coursework Help

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The idea is to give you the confidence to learn more yourself - like learning to snowplough as the first stage when skiing, or learning not to be scared of the water when learning to swim. Once you can compile and run programs, you can copy example source code and experiment with it to learn how it works. Like skiing and swimming, you can only learn programming by doing it. These extra techniques are useful when writing longer programs and are needed for next term.

For now, concentrate on learning how to use the language. The document includes some quick tests so that you can check your understanding, and some sections of extra information that you can show or hide. If you want to see all the extra sections, click on this Extras button.

Work through the document at your own speed. Try to get at least that far on your first day of programming. It also creates a folder called 1AComputing , a good place to store any course-related files. In the course of this work your screen might become rather cluttered. The Window management section of the New User Guide has some useful tips. You can also have variables that store a.

It distinguishes between upper and lower case characters - num and Num are different variables. Strings are sequences of characters.

They have extra functionality associated with them. For example, if you want to find the length of a string s , you can use s.

Whereas strings have double quotes around them, characters have single quotes, so to create a character variable and set it to x you need to do. Use cout short for " c onsole out put" to print to the screen. If you want to print text out, put double-quotes around it - e. To end a line and start a new one, use the special symbol endl. You can print several things out at once, so. All the examples so far have been fragments.

The code might calculate a value like a function in mathematics does but it might just perform a task like printing something to the screen. When the program is started, the main function is run first. So your program needs a main function which will look like this. Just remember that all your programs will probably need lines like these.

At the moment your 1AComputing folder is nearly empty. Type or copy-paste the following text into it.

In the Build menu, choose the Build option. This will try to compile your code. Testing can only prove the existence of bugs, not their absence - Dijkstra You may not get everything right first time. You can get a lot of error messages from just one mistake so just look at the first error message. Often, the compiler will report that the error is in a line just after where the mistake is. If you cannot spot the mistake straight away, look at the lines immediately preceding the reported line.

The most common errors will be due to undeclared variables or variables incorrectly declared, and missing or incorrect punctuation. Check to see that brackets match up, and check your spelling. For example, if you have a source file called program2. One of the most effective things to do in this situation is to use cout to print out the values of certain variables to help you diagnose where the problem is.

Look there first before asking a demonstrator for help. Many more tips are in the Troubleshooting section. Use cin short for " c onsole in put" to get values from the keyboard into variables.

The variables need to be created beforehand. If they type an integer, it will be stored in the num variable. You now know enough to write your own programs. Save it as adding. I suggest you start by taking a copy of program1. Your function needs to Create 2 integer variables Ask the user to type in 2 integers Use cin to read the values into your variables Print an output line looking rather like this The sum of 6 and 73 is The curly brackets are used to show which code is run if the condition is true.

You can have many lines of code within the curly brackets. If you do this on our system with geany the compiler will say. Be careful to avoid mixed-type comparisons - if you compare a floating point number with an integer the equality tests may not work as expected.

You can combine comparisons using boolean logic. Suppose you want to run a line of code if num is between 3 and 5. Instead you need to use. The order of execution of mathematical operations is governed by rules of precedence similar to those of algebraic expressions. Parentheses are always evaluated first, followed by multiplication, division and modulus operations. Addition and subtraction are last. The best thing, however, is to use parentheses brackets instead of trying to remember the rules.

Although addition, subtraction and multiplication are the same for both int egers and float s, division is different. You get a different result if the operands are defined as integers:. If at least one of the numbers is a real, the result will be a real. For repetitive tasks, use loops. Easiest is the while loop - code that repeatedly runs while some condition is true. When the computer runs this particular while loop, it continues printing num and adding one to it while num is less than 11, so it prints the integers from 1 to When you write a loop, always make sure that it will eventually stop cycling round, otherwise your program might "freeze".

Save it as timestable. If you put the while loop example inside a main routine like the one above, your program will nearly be finished - all you need to do is change the cout line so that it not only prints the variable that goes from 1 to 10, but the rest of the line too.

The final number does, but it can be expressed in terms of the first number on the line. Most programs have many functions. You can think of them as a black-boxes generating output from their input. Execution of the function code ends when a return statement is reached. Though short, it illustrates what you need to do when writing your own functions.

From now on, just about all your programs in every computing language you learn will use functions, so study this example carefully. This timesBy7 function needs to be given an integer as input. In this example its output is immediately printed out.

The code uses if and else which are quite easy to understand, I hope. You can read the " if " line as saying "if i is even, then do Read through the code until you understand it. Hi, my tutor has set a coursework for us and i need help with a small part of the coursework.

A small program where some one tests new programmes or you can call it benchmarking: Basically there are 20 programmes and he sets them each of them mark out of The program should also display a histogram and each star represents a mark. Any small help with coding and the layout will be greatly appreciated: Thanks for the reply mate anything helps. Oh might i ask, which IDE are you using?

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