var.c

里面包含很多c语言的源码

/* Demonstrates local variables. */

#include <stdio.h>

int x = 1, y = 2;

void demo(void);

int main( void )
{
  printf("\nBefore calling demo(), x = %d and y = %d.", x, y);
  demo();
  printf("\nAfter calling demo(), x = %d and y = %d\n.", x, y);

  return 0;
}

void demo(void)
{
    /* Declare and initialize two local variables. */

    int x = 88, y = 99;

    /* Display their values. */

    printf("\nWithin demo(), x = %d and y = %d.", x, y);
}