// exc1.c  first example simple output integer, string, double
//         note  //  makes rest of line a comment

#include <stdio.h>  // needed to do input and output

int main()  // short version to start main program  { to }
{
  int i = 7;     // declare variable i with initial value 7
  char ac = 'a'; // single character
  char msg[] = "sample string";  // declare msg with string in quotes
  float x = 37.95; // declare floating point x with initial value
  double y = 127.34e10; // declare double precision with initial value
    
  printf("exc1.c running\n");  // simple print title
  printf("i=%d \n", i);        // %d  for decimal  \n  for end of line
  printf("ac=%c \n", ac);      // %c  for character
  printf("msg=%s \n", msg);    // %s  for string
  printf("x=%f \n", x);        // %f  for simple floating point
  printf("y=%e \n", y);        // %e  for double with exponent
                               // many other  %  choices

  return 0;  // standard end of C main program
}