Programming algorithms of the linear structure

Laboratory work №  3 Programming algorithms of the linear structure 
The aim of the work: Drafting of the simplest of programs, realizing the conduct of the computing operations by the formulas that define the algorithm of linear structures. 
Linear algorithms is a sequence of blocks, each of which has one input and one output and is performed in the program only once.

Pic. 1. Algorithm of linear structures

 
The task. Calculate the area of a triangle of three known sides a, b, c, using theorem Gerona

The method for performing the work 
1. The program has a linear structure in accordance with the algorithm in Fig. 1. 
S1 - block of input data a, b, c. 
S2 - blocks calculation полупериметра triangle p and S. square 
S3 - block print the results: the area of S. 
1. Enter the program of the decision of this:

2. Compile the program and fix possible errors. Then start the program at the expense of 
3. Pass the test the calculation to verify proper operation of the program. 
Enter the values of the parties: (a=1, b=1, c=1. Should get the result S=0.433013.)

 
4. Run a series of calculations for various values of the sides of the triangle.

Tasks for independent work 
To compile a program in the C language for finding the value of an expression. 
The constants A, B, C are input from the keyboard 
 
Option 1 
if A=4, B=2, C=5 answer: -0.867393.

Option 2

If A=7, B=2, C=1 answer: -1.267885.

Option 3

If A=7, B=2, C=1 answer: -1.267885.

Option 4

If A=3, B=7, C=2 answer: 0.116161.

Option 5

If A=3, B=2, C=1 answer: 16718.692

The report should contain:

1) Texts of carried out programs.

2) Results of calculations.