入门练习2-4

#include <stdio.h>

int main(){

  int a, b, c, d;
  double x, y, z, n;

  a = 5 / 2;
  b = 5.0 / 2.0;
  c = 5.0 / 2;
  d = 5 / 2.0;

  x = 5 / 2;
  y = 5.0 / 2.0;
  z = 5.0 / 2;
  n = 5 / 2.0;

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

  printf("x=%f\n", x);
  printf("y=%f\n", y);
  printf("z=%f\n", z);
  printf("n=%f\n", n);

  return 0;}