What Will I Learn?

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In this tutorial, you will be able to :

• use the correct syntax for preprocessor directive, main function, and declaration statements;
• use printf() and scanf() functions; and,
• create a simple C program to convert Kilograms to pounds.

Requirements

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To be able to follow this tutorial, you need to have the following tools:

• A desktop PC or laptop with Windows (7, 8, 10) operating system; and,
• An installed GCC Compiler and Code:: Blocks Open Source cross-platform IDE software.

If you do not have the following software, you can download the Code:: Blocks software from codeblocks.org. For the GCC Compiler, you can download a MinGW compiler from mingw.org.

Difficulty

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Basic

General Structure of a C program

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The simplest computer programs perform three basic operations:

• get the input from the keyboard
• process the input data
• display the results on the screen

The most basic form of a C program follows a very simple format:

preprocessor directives
main function
{
declaration
statement
}

Tutorial Content for the simple C program to convert kilogram to pounds

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Part 1: Creating a New Project

1 | Open Code:: Blocks from your desktop or from your windows menu. Click to start a new project.

2 | Click from "New from template" wizard. Then click
.

3 | Click from the Console application wizard.

4 | Select language to C and click .

5 | Type in the project title in the Console application wizard then click .

6 | Click
to finalize the creation of a new project.

.

Part 2: Coding the simple C program for converting kilograms to pounds (includes discussion).

1 | Your first C program will starts with a preprocessor or compiler directives. This includes standard header #include <stdio.h and standard library #include <stdlib.h> .

2 | Define constant variable for your program by using the syntax #define kg_to_lbs 0.454 . Variable names is used to indicated data values. It may change based on actions in the program.

3 | C progam is a step-by-step programming by which it execute program from top to bottom. The main body of the program is enclosed inside { and } brackets. The proper syntax for the main body of the program should be:

int main()
{
//program codes here//
return(0)
}

4 | Identify variables names to be used in to the program float pounds, kilograms;.

int main()
{
float pounds, kilograms;
return(0)
}

5 | To ask for the weight in pounds, type in : printf("Enter weight in pounds:");
scanf("%f", &pounds); .

• printf() function is used to display text in the C program; and,
• scanf() is used to input data to the program. It allows to ask floating point number and then strored to a memory location pounds. This is done by the placeholder %f (recieve data) and &pound (store data to pounds).

Now include printf and scanf to int main().

int main()
{
float pounds, kilograms;
printf("Enter weight in pounds:");
scanf("%f", &pounds);
return(0)
}

6 | To convert pounds to kilogram, you need to input a kilograms = kg_in_lbs*pounds;. Add the code after scanf() function.

int main()
{
float pounds, kilograms;
printf("Enter weight in pounds:");
scanf("%f", &pounds);
kilograms = kg_in_lbs*pounds;
return(0)
}

7 | Now, to show the result, type in after the formula printf("%.2f Pounds is equal to %.2f Kilograms.\n", pounds, kilograms); .

int main()
{
float pounds, kilograms;
printf("Enter weight in pounds:");
scanf("%f", &pounds);
kilograms = kg_in_lbs*pounds;
printf("%.2f Pounds is equal to %.2f Kilograms.\n", pounds, kilograms);
return(0)
}

8 | Type in the codes above to the main.c on the code:: blocks.

9 | Click
to build the program.

10 | Click to run the program.

The result of the program.

Thank you for reading this tutorial. I hope you learn something. Stay tune for the next Code:: Blocks for Begginer tutorial series.

@juecoree

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Posted on Utopian.io - Rewarding Open Source Contributors

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