C_利用函数的引用调用实现两数的交换
源码:
# include <stdio.h>
void swap(int *x, int *y);
int main()
{
int i, j;
i = 12;
j = 36;
printf("i and j before swapping: %d %d\n", i, j);
swap(&i, &j); // 传递变量i和j的地址,深刻理解此时:&i为变量的地址,而i为变量(值)
// 调用swap函数的传递过程为:x=&i ; y=&j ;
printf("i and j after swapping: %d %d\n", i, j);
return 0;
}
void swap(int *x, int *y) // 深刻理解此时:*x为变量(值)而x为指针(地址)
{
int temp;
temp = *x; /* 存储变量x的值 */
*x = *y; /* 将y的值放入到x中 */
*y = temp; /* 将x的值放入到y中 */
}
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源码:
# include <stdio.h>
int main()
{
/* 定义变量并赋初值 */
int a = 5;
char c = 'a'; // 'a'的ASC码的值为97
  ......
源码:
# include <stdio.h>
int main()
{
/* 换行符'\n',用于输出换行 */
printf("How are you?\n");
printf("I am fine.\n\n");
/* 横向跳格符'\t',使跳到下一个输出区 */
  ......
源码:
# include <stdio.h>
int main()
{
/* 定义一个整数类型的变量,用来存放后面算式的值 */
int logic;
int a = 1;
int b = 2;
int c = 3;
&n ......
源码:
# include <stdio.h>
int main()
{
int i, j, k;
int m, n, p;
i = 8;
j = 10;
k = 12;
/* 自增在操作数之前 */
  ......
源码:
# include <stdio.h>
int main()
{
/* 定义一个整形指针p */
int *p;
int begin, end;
begin = 10;
/* 给指针p赋初值 */
p = &begin;
& ......