Skip to main content

5 Common C++ Programming Mistakes

To err is human

It is normal for programmers to make mistakes while learning c++ programming. Mistakes (or errors) are often caused by misconception in the programmers mind or by forgetting certain things. While syntax errors are easier to spot since the c++ compiler shows the related information but logical errors often remains unnoticed, and many a times the program works just as fine. It is not possible to completely eliminate errors by yourself but it is definitely possible to minimize them as a c++ programmer. Here I am listing 5 of the common mistakes (errors) that beginners commit (not sorted in any order).

Mistake No. 1

Have a look at this C++ Program

   #include<iostream.h>
   void main(void)
   {
   int base,height,area;
   cout<<"Enter the base and height of the triangle:";
   cin>>base>>height;
   area=0.5*base*height;
   cout<<endl<<"AREA:"<<area;
   }

Here the variable area is such that sometimes its value would be whole number and sometimes it would be fractional. As long as we are giving even data the program would output correctly, but giving odd data would result in the loss of data in the output, since the integer data type can’t hold fractional values.

Mistake No.2

  #include<iostream.h>
   void main(void)
   {
   char name[15]=’c++ program’;
   cout<<name;
   }

Here the problem is in the line char name[15]=’c++ program’; since we are giving string data as character constant. It should have been like this char name[15]=”c++ program”;

Mistake No. 3

   #include<iostream.h>
   void main(void)
   {
   int a=10,b=20,c;
   a+b=c;
   cout<<c;
   }

Can you spot the error, yes it is with the line a+b=c; here mathematical operations are being done in the left hand side and it is being assigned the value of the variable c, which is not possible. It should have been c=a+b;

Mistake No.4

   #include<iostream.h>
   void main(void)
   {
   int Name;
   cin>>name;
   cout<<"The value of Namee is:"<<name;
   }

I have seen many peoples committing this mistake, remember that C++ is Case-Sensitive, what it means is Name and name are two different identifiers for C++.

Mistake No. 5

   #include<iostream.h>
   void main(void)
   {
   int arr[3];
   cout<<"Enter three numbers:";
   cin>>arr[1]>>arr[2]>>arr[3];
   cout<<"The numbers are:"<<endl;
   cout<<arr[1]<<arr[23]<<arr[3];
   }

This is also one of the most common mistakes that c++ programmers commit. As I have previously discussed in the other articles that declaring an array as int arr[3]; means that it is for storing 3 elements of data type integer. And while accessing or modifying the index number starts with 0 and ends with one less than the total number of elements it can store.

Hope this article helps…

Popular posts from this blog

Fix For Toshiba Satellite "RTC Battery is Low" Error (with Pictures)

RTC Battery is Low Error on a Toshiba Satellite laptop "RTC Battery is Low..." An error message flashing while you try to boot your laptop is enough to panic many people. But worry not! "RTC Battery" stands for Real-Time Clock battery which almost all laptops and PCs have on their motherboard to power the clock and sometimes to also keep the CMOS settings from getting erased while the system is switched off.  It is not uncommon for these batteries to last for years before requiring a replacement as the clock consumes very less power. And contrary to what some people tell you - they are not rechargeable or getting charged while your computer or laptop is running. In this article, we'll learn everything about RTC batteries and how to fix the error on your Toshiba Satellite laptop. What is an RTC Battery? RTC or CMOS batteries are small coin-shaped lithium batteries with a 3-volts output. Most laptops use

The Best Way(s) to Comment out PHP/HTML Code

PHP supports various styles of comments. Please check the following example: <?php // Single line comment code (); # Single line Comment code2 (); /* Multi Line comment code(); The code inside doesn't run */ // /* This doesn NOT start a multi-line comment block /* Multi line comment block The following line still ends the multi-line comment block //*/ The " # " comment style, though, is rarely used. Do note, in the example, that anything (even a multi-block comment /* ) after a " // " or " # " is a comment, and /* */ around any single-line comment overrides it. This information will come in handy when we learn about some neat tricks next. Comment out PHP Code Blocks Check the following code <?php //* Toggle line if ( 1 ) {      // } else {      // } //*/ //* Toggle line if ( 2 ) {      // } else {      // } //*/ Now see how easy it is to toggle a part of PHP code by just removing or adding a single " / " from th

Designing a Simple Order Form Application in PHP

Ok guys, for this post we’re going to create a simple yet complete order form page. Order forms are used on many sites to take customers order online. Order forms should have the capability to take orders from visitors regarding what items they want to purchase and store the information for further processing. For this post’s example, we are going to create an order form for a Book Seller. The form will be designed to take order of five different items (books). Our order form application should be able to take order of five different items in any separate quantities tht user wants, it should also ask for shipping address and name of the customer. It should then store the information provided in a file along with the date and time order was placed. The application should also be able to take any number of orders and store them all linearly for further human processing. For this, we need a front end of a HTML form to which the user would interact a