Basic Structure of a C Program
Structure of C program
It is necessary to be aware of proper structure flow of programming language you are writing code in. Not following proper structure of program may lead to error. Structure of a language gives a basic idea of the order of sections in a program. Here we will discuss the different section of structure.
Basic Structure of C Program
A C Program have the following entities that define structure of the program –
- Preprocessor commands
- Functions
- Variables
- Statements and Expressions
- Comments
Sample code
Let’s take an example for exploring this section. Following is the code in C language to calculate the area of circle whose radius is 5.
#include<stdio.h>
#define PI 3.1416
float area (float r);
int main(void)
{
//Example of variables
float r = 5;
printf("Area: %.2f",area(r)); // This statement will print two digit after the point
return 0;
}
//Example of function
float area(float r)
{
//example of statements & Expression
return PI * r * r;
}
Output
Area: 78.54
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printf(“Area: %.2f”,area(r));
Explain please?
basically printf is for output so in this case (.2) will print only two number after the value of AREA suppose we wrote (.4) then it will print upto 4 number after the value of AREA
so our output woul;d be like this Area:78.54.
the value of r is 5 so it would be multiplied with PI*R*R.