条件陈述 [英] Conditional Statements
问题描述
嗨
我正在使用strcat编写条件语句。我正在尝试
要做的是添加文件扩展名''。txt''如果它还不存在。
我遇到的问题是如果已存在
，则返回一个值。随附的代码如下：
#include< stdio.h>
#include< string.h>
const int MAX_FILENAME = 256;
oid checkFilename（char * filename，char * extension）
{
int length;
int check;
length = strlen（filename）;
check = strcmp（filename，extension）;
if（check == 0）
return;
else
strcat（文件名，扩展名）;
返回;
int main（）{
char filename1 [MAX_FILENAME] =" testfile";
char filename2 [MAX_FILENAME] =" testfile.txt";
char filename3 [MAX_FILENAME] =" testfile.dat";
char extension [] =" .txt";
checkFilename（filename1，extension）;
checkFilename（filename2，extension）;
checkFilename（filename3，extension）;
printf（" 1：％s \ n"，filename1）;
printf（&quo t; 2：％s \ n"，filename2）;
printf（" 3：％s \ n"，filename3）;
}
有人能指出我正确的方向吗。
格雷格
Gregc。 schrieb：
嗨
我正在编写条件语句，使用strcat。我正在尝试做的是添加文件扩展名''。txt''，如果它还没有存在的话。
我遇到的问题是返回一个值，如果一个已经
存在。随附的代码如下：
#include< stdio.h>
#include< string.h>
const int MAX_FILENAME = 256;
oid checkFilename （char * filename，char * extension）
{
int length;
int check;
length = strlen（filename）;
check = strcmp（filename，extension ）;
if（check == 0）
return;
strcat（文件名，扩展名）;
返回;
int main（）{char filename1 [MAX_FILENAME] =" testfile";
char filename2 [MAX_FILENAME] =" testfile.txt";
char filename3 [MAX_FILENAME] = " testfile.dat";
char extension [] =" .txt" ;;
checkFilename（filename1，extension）;
checkFilename（filename2，extension）;
checkFilename（filename3，extension）;
printf（" 1：％s \ n"，filename1）;
printf（" 2：％s \ n"， filename2）;
printf（" 3：％s \ n"，filename3）;
}
有人能指出我正确的方向。
Greg
一个解决方案，有效，但必须清楚地检查:)
#include< stdio.h>
#include< string.h>
#define MAX_FILENAME 256
void checkFilename（char * filename，char * extension）
{
int length;
int check;
char * pToString;
if（b ！strstr（文件名，扩展名））
{
pToString = strchr（filename，''。''）;
if（pToString）
{
pToString [1] =''t'';
pToString [2] =''x'' ;
pToString [3] =''t'';
pToString [4] =''\ 0'';
}
else
{
strcat（文件名，扩展名）;
}
}
}
int main（）{
char filename1 [MAX_FILENAME] =" testfile";
char filename2 [MAX_FILENAME] =" testfile.txt";
char filename3 [MAX_FILENAME] =" testfile.dat" ;
char extension [] =" .txt" ;;
checkFilename（filename1，extension）;
checkFilename（filename2，extension）;
checkFilename（filename3，extension）;
printf（" 1：％s \ n"，filename1）;
printf（" 2：％s \ n"，filename2）;
printf（" 3：％s \ n"，filename3）;
getch（）;
}
Zero写道：一个解决方案，有效，但必须清楚检查:)
#include< stdio.h>
#include< string.h>
#define MAX_FILENAME 256
void checkFilename（char * filename，char * extension）
{
int length;
int check;
char * pToString;
if（！strstr（filename，extension））
考虑情况BlatxtBla.ext
{
pToString = strchr（filename，' '）。';
考虑情况Bla.Bla.ext
如果（pToString）
{
pToString [1] =''t'';
pToString [2] =''x'';
pToString [3] =''t'';
pToString [4] =''\ 0'';
}
{
strcat（文件名，扩展名）;
考虑缓冲区不足以保持
扩展的情况
}
}
}
int main（）{/ name> [MAX_FILENAME] =" testfile";
char filename2 [MAX_FILENAME] =" testfile.txt" ;;
char filename3 [MAX_FILENAME] =" testfile.dat";
char extension [] =" .txt" ;;
checkFilename（filename1，extension）;
checkFilename （filename2，扩展名）;
checkFilename（filename3，extension）;
printf（" 1：％s \ n"，filename1）;
printf（" 2 ：％s \ n"，filename2）;
printf（" 3：％s \ n"，filename3）;
getch（）;
哪里是退货声明？
}
Abdo Haji-Ali
程序员
In | Framez
" Gregc。写道：
我正在编写一个条件语句，使用strcat。我想要做的是添加文件扩展名''。txt''，如果它还没有存在的话。我遇到的问题是返回一个
值，如果已存在的话。附上的代码如下：
查找strrchr（）函数。
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另见< http：//www.safalra .com / special / googlegroupsreply />
Hi
I am writing a conditional statement, using strcat. What I am trying
to do is to add the file extenstion ''.txt'' if it doesn''t already exist.
What I am having trouble with is returning a value if one already
exists. Attached is the code below:
#include <stdio.h>
#include <string.h>
const int MAX_FILENAME = 256;
oid checkFilename (char *filename, char *extension)
{
int length;
int check;
length = strlen(filename);
check=strcmp(filename,extension);
if(check==0)
return;
else
strcat(filename,extension);
return;
int main () {
char filename1 [MAX_FILENAME] = "testfile";
char filename2 [MAX_FILENAME] = "testfile.txt";
char filename3 [MAX_FILENAME] = "testfile.dat";
char extension [] = ".txt";
checkFilename (filename1, extension);
checkFilename (filename2, extension);
checkFilename (filename3, extension);
printf("1: %s\n", filename1);
printf("2: %s\n", filename2);
printf("3: %s\n", filename3);
}
Could someone point me in the right direction.
Greg
Gregc. schrieb:
Hi
I am writing a conditional statement, using strcat. What I am trying
to do is to add the file extenstion ''.txt'' if it doesn''t already exist.
What I am having trouble with is returning a value if one already
exists. Attached is the code below:
#include <stdio.h>
#include <string.h>
const int MAX_FILENAME = 256;
oid checkFilename (char *filename, char *extension)
{
int length;
int check;
length = strlen(filename);
check=strcmp(filename,extension);
if(check==0)
return;
else
strcat(filename,extension);
return;
int main () {
char filename1 [MAX_FILENAME] = "testfile";
char filename2 [MAX_FILENAME] = "testfile.txt";
char filename3 [MAX_FILENAME] = "testfile.dat";
char extension [] = ".txt";
checkFilename (filename1, extension);
checkFilename (filename2, extension);
checkFilename (filename3, extension);
printf("1: %s\n", filename1);
printf("2: %s\n", filename2);
printf("3: %s\n", filename3);
}
Could someone point me in the right direction.
Greg
One solution, which works but has to be checked clearly :)
#include <stdio.h>
#include <string.h>
#define MAX_FILENAME 256
void checkFilename (char *filename, char *extension)
{
int length;
int check;
char * pToString;
if(!strstr(filename,extension))
{
pToString = strchr(filename,''.'');
if (pToString)
{
pToString[1] = ''t'';
pToString[2] = ''x'';
pToString[3] = ''t'';
pToString[4] = ''\0'';
}
else
{
strcat(filename,extension);
}
}
}
int main () {
char filename1[MAX_FILENAME] = "testfile";
char filename2[MAX_FILENAME] = "testfile.txt";
char filename3[MAX_FILENAME] = "testfile.dat";
char extension [] = ".txt";
checkFilename (filename1, extension);
checkFilename (filename2, extension);
checkFilename (filename3, extension);
printf("1: %s\n", filename1);
printf("2: %s\n", filename2);
printf("3: %s\n", filename3);
getch();
}
Zero wrote:One solution, which works but has to be checked clearly :)
#include <stdio.h>
#include <string.h>
#define MAX_FILENAME 256
void checkFilename (char *filename, char *extension)
{
int length;
int check;
char * pToString;
if(!strstr(filename,extension)) Consider the situation "BlatxtBla.ext"
{
pToString = strchr(filename,''.''); Consider the situation "Bla.Bla.ext"
if (pToString)
{
pToString[1] = ''t'';
pToString[2] = ''x'';
pToString[3] = ''t'';
pToString[4] = ''\0'';
}
else
{
strcat(filename,extension); Consider the situation where the buffer is not big enough to hold the
extenstion
}
}
}
int main () {
char filename1[MAX_FILENAME] = "testfile";
char filename2[MAX_FILENAME] = "testfile.txt";
char filename3[MAX_FILENAME] = "testfile.dat";
char extension [] = ".txt";
checkFilename (filename1, extension);
checkFilename (filename2, extension);
checkFilename (filename3, extension);
printf("1: %s\n", filename1);
printf("2: %s\n", filename2);
printf("3: %s\n", filename3);
getch(); Where''s the return statement?
}
Abdo Haji-Ali
Programmer
In|Framez
"Gregc." wrote:
I am writing a conditional statement, using strcat. What I am
trying to do is to add the file extenstion ''.txt'' if it doesn''t
already exist. What I am having trouble with is returning a
value if one already exists. Attached is the code below:
Look up strrchr() function.
--
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the broken "Reply" link at the bottom of the article. Click on
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More details at: <http://cfaj.freeshell.org/google/>
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