Managing Input and Output Operations

All the options of printing a real number are illustrated in program.
#include <stdio.h>
void main()

{
double y=98.7654;
printf("%7.4f\n", y);
printf("%f\n", y);
printf("%7.2f\n", y);
printf("%-7.2f\n", y);
printf("%07.2f\n", y);
printf("%*.*f", 7, 2, y);
printf("\n");
printf("%10.2e\n", y);
printf("%12.4e\n", -y);
printf("%-10.2e\n", y);
printf("%e\n", y);
getch();
}