📅  最后修改于: 2020-10-31 14:16:59             🧑  作者: Mango
Jerry提交了代码的第一个版本。但是他认为他应该编写两个函数来接受输入和显示数组内容。修改后, array.c看起来如下。
#include
#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];
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
上面的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在行之前显示+号,对于已删除的行,其显示–号。现在,Jerry尝试使用以下命令来提交更改:
[jerry@CentOS trunk]$ svn commit -m "Add function to accept input and to display array contents"
上面的命令将产生以下结果。
Sending trunk/array.c
svn: Commit failed (details follow):
svn: File or directory 'array.c' is out of date; try updating
svn: resource out of date; try updating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,并且Jerry的工作副本已过期。为了避免覆盖彼此的更改,Subversion使此操作失败。 Jerry必须先更新工作副本,然后才能提交更改。因此他使用update命令,如下所示。
[jerry@CentOS trunk]$ svn update
G array.c
Updated to revision 3.
Subversion在文件名前显示字母G ,表示该文件已合并。
[jerry@CentOS trunk]$ svn diff
上面的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文件已合并。如果仔细观察,Subversion现在显示的是修订号3。在上一个输出中,它显示的是修订号2。只需查看谁在文件中进行了更改以及出于什么目的。
jerry@CentOS trunk]$ svn log
------------------------------------------------------------------------
r3 | tom | 2013-08-18 20:21:50 +0530 (Sun, 18 Aug 2013) | 1 line
Fix array overflow problem
------------------------------------------------------------------------
r2 | jerry | 2013-08-17 20:40:43 +0530 (Sat, 17 Aug 2013) | 1 line
Initial commit
------------------------------------------------------------------------
r1 | jerry | 2013-08-04 23:43:08 +0530 (Sun, 04 Aug 2013) | 1 line
Create trunk, branches, tags directory structure
------------------------------------------------------------------------
现在, Jerry的工作副本已与存储库同步,他可以安全地提交更改。
[jerry@CentOS trunk]$ svn commit -m "Add function to accept input and to display array contents"
Sending trunk/array.c
Transmitting file data .
Committed revision 4.