Jerry 已经提交了第一个版本的代码.但他认为他应该编写两个函数来接受输入并显示数组内容.修改后, array.c 如下所示.
#include#define MAX 16void accept_input(int *arr, int n) { int i; for (i = 0; i < n; ++i) scanf("%d", &arr[i]);}void display(int *arr, int n) { int i; for (i = 0; i < n; ++i) printf("|%d| ", arr[i]); printf("\n");}int main(void) { int i, n, arr[MAX]; printf("Enter the total number of elements: "); scanf("%d", &n); printf("Enter the elements\n"); accept_input(arr, n); printf("Array has following elements\n"); display(arr, n); return 0;}
Jerry 编译并测试他的代码,并准备提交更改.在此之前,他想使用以下命令查看更改.
[jerry @ CentOS trunk] $ svn diff
上述命令将产生以下结果.
Index: array.c===================================================================--- array.c (revision 2)+++ array.c (working copy)@@ -2,6 +2,24 @@ #define MAX 16 +void accept_input(int *arr, int n)+{+ int i;++ for (i = 0; i & n; ++i)+ scanf("%d", &arr[i]);+}++void display(int *arr, int n)+{+ int i;++ for (i = 0; i < n; ++i)+ printf("|%d| ", arr[i]);+ + printf("\n");+}+ int main(void) { int i, n, arr[MAX];@@ -10,15 +28,10 @@ scanf("%d", &n); printf("Enter the elements\n");+ accept_input(arr, n); - for (i = 0; i < n; ++i)- scanf("%d", &arr[i]);- printf("Array has following elements\n");- for (i = 0; i < n; ++i)- printf("|%d| ", arr[i]);- - printf("\n");+ display(arr, n); return 0; }
对于新添加的行,Subversion在行前显示 + 符号对于删除的行,它显示 - 符号.现在,Jerry尝试使用以下命令提交更改:
[jerry@CentOS trunk]$ svn commit -m "Add function to accept input and to display array contents"
上述命令将产生以下结果.
Sending trunk/array.csvn: Commit failed (details follow):svn: File or directory 'array.c' is out of date; try updatingsvn: resource out of date; try updating
Subversion不允许提交 Jerry的更改,因为 Tom 已经修改了存储库而
[jerry@CentOS trunk]$ svn updateG array.cUpdated to revision 3.
Subversion在文件名前显示字母 G ,这意味着文件已合并.
[jerry @ CentOS trunk] $ svn diff
上述命令将产生以下结果.
Index: array.c===================================================================--- array.c (revision 3)+++ array.c (working copy)@@ -2,6 +2,24 @@ #define MAX 16 +void accept_input(int *arr, int n)+{+ int i;++ for (i = 0; i < n; ++i)+ scanf("%d", &arr[i]);+}++void display(int *arr, int n)+{+ int i;++ for (i = 0; i < n; ++i)+ printf("|%d| ", arr[i]);+ + printf("\n");+}+ int main(void) { int i, n, arr[MAX];@@ -15,15 +33,10 @@ } printf("Enter the elements\n");+ accept_input(arr, n); - for (i = 0; i < n; ++i)- scanf("%d", &arr[i]);- printf("Array has following elements\n");- for (i = 0; i < n; ++i)- printf("|%d| ", arr[i]);- - printf("\n");+ display(arr, n); return 0; }
Subversion仅显示 Jerry的更改,但 array.c 文件是合并.如果仔细观察,Subversion现在显示版本号3.在上一个输出中,它显示的是版本号2.只需查看谁在文件中进行了更改以及用于何种目的.
jerry@CentOS trunk]$ svn log------------------------------------------------------------------------r3 | tom | 2013-08-18 20:21:50 +0530 (Sun, 18 Aug 2013) | 1 lineFix array overflow problem------------------------------------------------------------------------r2 | jerry | 2013-08-17 20:40:43 +0530 (Sat, 17 Aug 2013) | 1 lineInitial commit------------------------------------------------------------------------r1 | jerry | 2013-08-04 23:43:08 +0530 (Sun, 04 Aug 2013) | 1 lineCreate trunk, branches, tags directory structure------------------------------------------------------------------------
现在 Jerry的工作副本与存储库同步,他可以安全地提交他的更改.
[jerry@CentOS trunk]$ svn commit -m "Add function to accept input and to display array contents"Sending trunk/array.cTransmitting file data .Committed revision 4.