Variable and data types

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

int main()
{
  int i1;
  printf("i1=%d\n",i1);

  i1 = 5;
  printf("i1=%d\n",i1);

  i1 = -3;
  printf("i1=%d\n",i1);

  i1 = 3.5;
  printf("i1=%d\n",i1);

  double d1 = 3.5;
  printf("d1=%lf\n",d1);

  d1=0;
  printf("d1=%lf\n",d1);

  float f1 = 3.7;
  printf("f1=%f\n",f1);

  char c = 'A';
  printf("%c\n",c);

  c=65;
  printf("%c\n",c);

  int code ='A';
  printf("%d\n\n",code);

  _Bool b=0;
  printf("b=%d\n",b);

  b=1;
  printf("b=%d\n",b);

  b=2;
  printf("b=%d\n",b);

  b=-1;
  printf("b=%d\n",b);

  b=false;
  printf("using keywords b=%d\n",b);
  b=true;
  printf("using keywords b=%d\n\n",b);

  char name[]="Tharaka Weerasena";
  printf("%s\n",name);

  int x = sizeof (int);
  printf("number of bytes of an int:%d bytes\n",x);
  printf("number of bits:4*8=32 bits\n");
  printf("we can store 2^32 in an integer"); //429496796


    system("pause");
    return 0;
}