'area' is assigned a value which is neverused# define PI 3.1416main(){float Radius,Area;scanf(%f,&Radius);Area=PI*Radius*Radius;Printf(%f\n,Area);}\x1a

'area' is assigned a value which is neverused# define PI 3.1416main(){float Radius,Area;scanf(%f,&Radius);Area=PI*Radius*Radius;Printf(%f\n,Area);}\x1a
'area' is assigned a value which is neverused
# define PI 3.1416
main()
{
float Radius,Area;
scanf(%f,&Radius);
Area=PI*Radius*Radius;
Printf(%f\n,Area);
}\x1a

'area' is assigned a value which is neverused# define PI 3.1416main(){float Radius,Area;scanf(%f,&Radius);Area=PI*Radius*Radius;Printf(%f\n,Area);}\x1a
main()
{
.
scanf("%f",&Radius);
.
printf("%f\n",Area);
}