函数返回与局部变量 

 1 // Test1.cpp : 定义控制台应用程序的入口点。
 2 //
 3 /************************************************************************/
 4 /* this Program is Show How the local value and the function return value... */
 5 /************************************************************************/
 6 
 7 #include "stdafx.h"
 8 #include "stdio.h"
 9 #include "windows.h"
10 
11 int x; 
12 int modifyvalue() 
13 { 
14     return(x+=10); 
15 } 
16 int changevalue(int x) 
17 { 
18     return(x+=1); 
19 } 
20 
21 int _tmain(int argc, _TCHAR* argv[])
22 {
23     int x=10; 
24     x++;    //after this  x is 11
25     changevalue(x);    //after changevalue return 12,but the x is still 11    
26     x++;     //after this  x is 12
27     modifyvalue(); //this did not change the value of x
28     printf("First output:%dn",x);     //now x is 12
29 
30     x++;   //after this x is 13
31     changevalue(x);    //after changevalue return 14,but the x is still 13 
32     printf("Second output:%dn",x);    //now x is 13
33     modifyvalue();      //this did not change the value of x
34     printf("Third output:%dn",x); //the  x is  still 13
35 
36     system("pause");
37     return 0;
38 }

 

posted @ 2012-04-11 21:40  imFolish  阅读(360)  评论(0)  编辑  收藏  举报