Tag Archives: Programming

Typecasting in C programming

Typecasting is a way to convert variables, constants or expression from one type to another type. Conversion from one type to another is often required in programming.

Consider a case where you want to find average of three numbers. Let us write a program to find average of three numbers.

#include <stdio.h>

int main()
{
    int num1, num2, num3;
    float average;
    num1 = 91;
    num2 = 85;
    num3 = 83;

    average = (num1 + num2 + num3) / 3;

    printf("Average = %f", average);

    return 0;
}

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List of all data types in C programming

In the series of learning programming, we learned about data types. Data type is a system for defining various properties of data stored in memory. Properties such as, type of data, range of data, bytes occupied etc.

Data type in C programming is categorized three categories.

  1. Primitive data type
  2. Derived data type
  3. User defined type

Read more - List of all format specifiers in C

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How to find range of data types in C programming?

In C programming data types play a major role, so is their size and range. The sizeof() operator gives you bytes required to store value of some type in memory. However, in programming you must be aware of range of a type to avoid overflow and underflow errors.

The size of a data type is compiler dependent and so is its range. So, you must not hardcode size and range values in your program.

There are two ways to find minimum and maximum range of a type. You can use any of the approach to get range of a type.

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sizeof() operator in C programming

Size of a data type is machine dependent and vary from compiler to compiler. However, in programming there exists situations when we need to know total bytes a type occupies in memory. To find exact size of a type in C programming we use sizeof() operator.

sizeof() is a special operator used to find exact size of a type in memory. The sizeof() operator returns an integer i.e. total bytes needed in memory to represent the type or value or expression.

The sizeof() is much used operator by programmers. It is very useful for developing portable programs.

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Data types in C programming

Data type is a system for defining various basic properties about the data stored in memory. Properties such as, type of data, range of data, bytes occupied, how these bytes are interpreted etc.

For example: int is a data type used to define integer type variables.
int a; here a is an integer type variable. It can store numbers from -2,147,483,648 to +2,147,483,647.

Data types in C is classified in three broad categories.
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Comments in C programming

Comment is non-executable line in source code used to describe a piece of code or program. Comments provides inline documentation of source code and enhances readability of the code. It describes what a piece of code does.

Comments are for readers not for compilers. They make source code more developer friendly.

The compiler has nothing to do with comments, it is non-executable piece of code. Therefore, during the compilation process, pre-processor removes all comments from the source code.

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Literals in C programming

Constant values used within a program are known as Literals. These constant values occupy memory but do not have any reference like variables. Or as Wikipedia speaks literal is a notation for representing a fixed value within a source code.

There are four types of literals in C programming.

  1. Integer literal
  2. Float or real literal
  3. Character literal
  4. String literal

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