try yourself |run program

#include <stdio.h> 
#include <conio.h> 
void main(){ 
 double a;
 clrscr();
 printf("Enter value of a: ");
 scanf("%lf",&a);/*  %.2f is used to print two decimal places. */
 printf("\n value of a = %.2lf",a);
 getch();
}

Program Output

Enter value of a: 5421.4231
value of a = 5421.42