/* 
   Program# 2 
   date : 10-12-2008
   Area of circle
*/

#include <stdio.h>
main(){
float r,p,c;
r=5.0;
p=3.14;
c=p*r*r;        
printf("\nArea of circle : %.1f\n",c);
}

In this program,area of circle is calculated using the given values.There are two multiplication operators found in a single expression, they are evaluated from left to right, that is first (p*r) is evaluated and the result is multiplied again with r,which is to say p*r*r is evalauted as (p*r)*r.Remember ( ) has highest precedence.The hierarchy of commonly used operators is shown below.

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