void swap_int(int a, int b)
{
int temp = a;
a = b;
b = temp;
}
void swap_int(int *a, int *b)
{
int temp ;
temp=*a;
*a=*b;
*b=temp;
}
void swap_str(char *a, char *b) //两字符串没有交换
{ //交换了两个字符串的地址，按值传递
char *temp = a;
a = b;
b = temp;
}
void swap_str(char **a, char **b)
{
char *temp ;
temp=*a;
*a = *b;
*b = temp;
}
int main()
{
int a = 10;
int b = 5;
int a1=2;
int b1=3;
char *str_a = "hello world";
char *str_b = "world hello";
swap_int(a, b);
swap_str(str_a, str_b);
printf("%d, %d,%d, %d, %s, %s", a, b, a1,b1,str_a, str_b);
//10, 5, hello world, world hello
//都是按值传递，不改变原值
swap_int(&a1,&b1);
printf("%d, %d ,a1,b1); //3,2
char *str_a1= "hello ";
char *str_b1= "world ";
swap_str(&str_a1, &str_b1);
printf(" %s, %s", str_a1, str_b1);//world, hello
return 0;
}