C Program to Calculate Area of Scalene Triangle

#include<stdio.h>
#include<math.h>
int main()
{
int s1,s2,angle;
float area;
clrscr();
printf("\nEnter Side1 : ");
scanf("%d",&s1);

printf("\nEnter Side2 : ");
scanf("%d",&s2);

printf("\nEnter included angle : ");
scanf("%d",&angle);

area = (s1 * s2 * sin((M_PI/180)*angle))/2;

printf("\nArea of Scalene Triangle : %f",area);
return(0);
}

Enter Side1 : 3
Enter Side2 : 4
Enter included angle : 30
Area of Scalene Triangle : 3.000000

C Program for Beginners : Area of Scalene Triangle



Properties of Scalene Triangle :

Scalene Triangle does not have sides having equal length.
No angles of Scalene Triangle are equal.
To calculate area we need at least two sides and the angle included by them.


Formula to Find Area of Scalene Triangle :



Explanation and Program Logic :

Part 1 : M_PI
sin((M_PI/180)*angle)

It is Constant defined in math.h Header File
It contain value = 3.14 in short instead of writing 3.14 write directly M_PI.


Part 2 : ( M_PI / 180 ) * angle

We are accepting angle in degree.
C function sin takes argument in radian , so to convert angle into radian we are purposefully writing above statement.


Part 3 : sin function

It computes sine of an angle

The % Format Specifiers in C

The % specifiers that you can use in ANSI C are:

Usual variable type Display

%c: char single character

%d (%i): int signed integer

%ld: long signed integer

%hd short signed integer

%e (%E): float or double exponential format

%f: float signed decimal

%lf: double signed decimal

%g: (%G) float or double use %f or %e as required

%o: int unsigned octal value

%p: pointer address stored in pointer

%s: array of char sequence of characters(string)

%u: int unsigned 

%lu: long unsigned

%x: (%X) int unsigned hex value

C Program to find area and circumference of circle

#include<stdio.h>

int main()
{
int rad;
float PI=3.14,area,ci;

clrscr();

printf("\nEnter radius of circle: ");
scanf("%d",&rad);

area = PI * rad * rad;
printf("\nArea of circle : %f ",area);

ci = 2 * PI * rad;
printf("\nnCircumference : %f ",ci);

return(0);
}

Output :


Enter radius of a circle : 1
Area of circle : 3.140000
Circumference  : 6.280000


If you have any problem regarding any program, mail me at tanveersingh800@gmail.com

Introduction to C language for beginners

C is a general-purpose high level language that was originally developed by Dennis Ritchie for the Unix operating system. It was first implemented on the Digital Eqquipment Corporation PDP-11 computer in 1972.

The Unix operating system and virtually all Unix applications are written in the C language. C has now become a widely used professional language for various reasons.

• Easy to learn
• Structured language
• It produces efficient programs.
• It can handle low-level activities.
• It can be compiled on a variety of computers.

Facts about C

• C was invented to write an operating system called UNIX.
• C is a successor of B language which was introduced around 1970
• The language was formalized in 1988 by the American National Standard Institue (ANSI).
• By 1973 UNIX OS almost totally written in C.
• Today C is the most widely used System Programming Language.
• Most of the state of the art software have been implemented using C

Why to use C ?

C was initially used for system development work, in particular the programs that make-up the operating system. C was adoped as a system development language because it produces code that runs nearly as fast as code written in assembly language. Some examples of the use of C might be:

• Operating Systems
• Language Compilers
• Assemblers
• Text Editors
• Print Spoolers
• Network Drivers
• Modern Programs
• Data Bases
• Language Interpreters
• Utilities

C Program File

All the C programs are writen into text files with extension ".c" for example hello.c. You can use "vi" editor to write your C program into a file.

This tutorial assumes that you know how to edit a text file and how to write programming insturctions inside a program file.

C Compilers

When you write any program in C language then to run that program you need to compile that program using a C Compiler which converts your program into a language understandable by a computer. This is called machine language (ie. binary format). So before proceeding, make sure you have C Compiler available at your computer. It comes alongwith all flavors of Unix and Linux.

If you are working over Unix or Linux then you can type gcc -v or cc -v and check the result. You can ask your system administrator or you can take help from anyone to identify an available C Compiler at your computer.