Function_0629

int Add(int x, int y);//函数声明
int main()
{
  int a = 10;
  int b = 20;
  int sum = 0;
  sum = Add(a, b);//函数调用
  printf("%d\n", sum);
  return 0;
}
//函数定义
int Add(int x, int y)
{
  int z = x + y;
  return z;
}

#include 
void print(int n) //1234   
{
  if(n>9) 
  {
    print(n/10);
  }
  printf("%d ", n%10);//4  123-3  12-2 1
}
int main()
{
 int num = 1234;
 print(num);
 return 0; 
}

//创建了临时变量！！！
int my_strlenth(char* str)
{
  int count = 0;//临时变量
  while ('\0' != *str)
  {
    count++;
    str++;
  }
  return count;
}
int main()
{
  char arr[] = "ajdjka";
  int length = my_strlenth(arr);
  printf("length=%d\n", length);
  return 0;
}
**递归的方法
int my_strlenth(char* str)
{
  if (*str != '\0')
  {
    return 1 + my_strlenth(str + 1);
  }
  else
    return 0;
}