This document discusses a programming problem involving calculating the area of a circle using scanf() and printf() functions in C programming language. It provides instructions on including header files, defining constants, getting user input with scanf(), calculating area using a defined constant pi and the radius, and outputting the result using printf(). It also includes some additional reading links about scanf() and printf() functions.

1. PBL8.2
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2. PBL 8.2
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PBL3
scanf () printf()
- scanf()
printf()
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http://www.lks.ac.th/kuanjit/sc

3. anf.htm
http://ba.hcu.ac.th/Elearning/
elearn.htm
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scanf() printf()

4. #include<stdio.h>
#include<conio.h>
#define pl 3.14159285
void main()
{ float area,r;clrscr();
printf("Enter the number:n");
scanf("%f",&r);
area=pl*r*r;
printf("Area is: %fn",area);
getch();
}