{}
#include <stdio.h>
int main()
{
printf("Hello World!\n");
printf("-------------------------\n");
printf("The number is %d\n", 23);
printf("some prime numbers are %d, %d, %d, %d\n", 2,3,5,7);
printf("-----------------------\n");
printf("The value of pi is %f\n", 3.14);
printf("Value of pi upto 2 decimal place %.0f\n", 3.14);
printf("an integer %d and a float numer %f\n", 12, 5.4);
printf("---------------------------\n");
printf("this is a character %c\n", 'a');
printf("----------------------------\n");
printf("calculate circumference %f\n", 2.0*3.14*32);
printf("some complicated calculation %f\n", 2*5*3.14 - 15/23 - 51.0);
return 0;
}