1 like 0 dislike
13.1k views

A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如,"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

[Exam] asked in Final Exam
ID: 42299 - Available when: 2018-01-17 14:00 - Due to: Unlimited

retagged by | 13.1k views

37 Answers

0 like 0 dislike
Hidden content!
** **** * *
* * ***** ** * *

int main()
{
* ** * *** char *
** * * * * int i,c=0;
* * * * * *   *** *** * **
*** ** * *   * ** ** **** ** ** ******* *
** ** ** ** * ***** * * * **
* * ****** {
* ** ***** * ** * *** * ******
* ******* * *** ** * * *** * {
* * * * ** * ** * * * * * ** *** * *** ** *** **
** * * ** **** * ** * * ** ** * * {
*** **               * ** * ** * c=0;
* * * ** * * * * * * * * * * **** *** * * * * * }
** **** * * * *** * ** *** * * ** else * * * ** **** *** * *
** ** * * ** * ****** ** ** ** * *** ** ** *** {
* * ** *** * ** * ** * * * * ** ** * * ** *** c++;
** ** *** *** ** ** ** *** * ***** * * *** * }
*** *** * * * ** * }
* * ** * ** *
* ** * if(c==0)
* * ***** * * ** * * ***** ** is not a prefix of * *** * **
**** ** *** * else
* * * ** * ** * * *** * ** * is a prefix of ** * * * *
* ** ** * * }
* * ** return 0;
}
answered by (-258 points)
edited by
0 0
prog.c: In function 'main':
prog.c:8:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&a);
           ^
prog.c:9:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&b);
           ^
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
prog.c: In function 'main':
prog.c:10:6: warning: implicit declaration of function 'stlen' [-Wimplicit-function-declaration]
   if(stlen(b)>strlen(a))
      ^~~~~
/tmp/ccnE3ufV.o: In function `main':
prog.c:(.text+0x5b): undefined reference to `stlen'
collect2: error: ld returned 1 exit status
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
0 like 0 dislike
Hidden content!
**** * * **** * *
* ** ** * ***
int main()
{
*** *** ** ** ap;
* *** * * ** * * *** * || ap=a)
** *** ** * * * * * * * *** ** is a prefix of abcde\n");
* * ****** ***
** * * * *** *
** * * * ** * ** * *** * *** ** * * * is not a prefix of abcde");
** * ** **** * ** ** * *** * ** * * ** ** * * * * ** ** * 0;
* * ** * * * *** * * * * * ** * ** *** *** ** * ** * * ***
  
answered by (-167 points)
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^
0 like 0 dislike
Hidden content!
* * * *** **** ***
* *** ** *

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
***** * * * ** ** ******* i<pl; i++)
** * **** ** ** *****
* * * ** ** * * ** * * ** * *** * * (p[i]==s[i])
******* * ********* ** *** * ** **** **** *
** * **** * * * **** ** * * * ** * ****** * * ******* * * ** * *******
*** * ******* ** ** ** ** *** * * * * * * ** * ****** *
** *** *** * * * * ********* * ** ** *** * * ***** * * ** * ** * ** * ** * * ** * * 1;
* ** * ** * * ** ** ** ** * * * ***** *** * *** ** *** * *****
*** ********** *** * *** * * * ** *** **
* * ** ** * ** ** * ** * * *** ** ** **** if(p[i]!=s[i])
* *** ********* ** ** * * * * ** ** * * * * * ** *****
** *** * * **** * *** ** * ******** **** ** *** * * **** * * * *** ** 0;
* * * * *** * ** * *** * *** ** * **
* * *** * * * ** ** * *
}


int main()
{
* * * **
**** **
* *** * * ",p);
* *** ** *
* *** ** * *** *

sl=strlen(s);
pl=strlen(p);


* * **** && pl<sl)
{

* ** ** * * ** * ** * ** *** *** ** * is a prefix of %s",p,s);
}else
{
printf("%s is not a prefix of %s",p,s);
}





}
answered by (-336 points)
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
0 like 0 dislike
Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
** ** ** *** ** * * ** a[99],b[99];
    int l,i;
* * *** ************* * ** ** **
* ** * *** * ** * * ***
**** *** * ******* * *
* ** ** * ** * ** * * * ***** **
    {
* * * * * * * * * * ***** *** * ** * * * * **
** **** * ** **** * * * ** * * * * * ** * ** *
** * ** * * * * * ** **** * * * * * * * * * * * ** * ** * a prefix of %s",a,b);
***** * * * ********** *** * * * ***** * ** ********* * ** * * ** **
** * ** * * * * * * * ** ** * **** * * *****
** * * * ** * * * * * * * ** *** ***
*** * *** ** ***** *** * * **** ***
***** ** *** * * **** * * * ** ** * ** ***** * ** ***** * ******** * ** not a prefix of %s",a,b);
** * * * ** ***** ** * * * * * * *** ** * **** * * * ****** ** * * * *
** * *** ** ****** * * * * * ****
    }


}
answered by (-255 points)
edited by
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 like 0 dislike
Hidden content!
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int prefix(char a[100],char b[100]);


int prefix(char a[100],char b[100])
{
** * **** *** *** *** i;
* ** *** ** * **** * * count=0;
* *** ** * ** * *** len;

* ***** ** *** **** * ***

** * ** ** ** * *
***** *** ******* * *** ***
* * * **** * ** *** *** * * ** * * *** ** * **
*** * ** * ** * * * * ** * * ** * ** * * * *
******* *** *** ** *** ** *** * *** ** * *** * * ** * * * * ***** *** *
* * ** **** * * * *** * **** * * ** * * ** * *** **
*** ** * ** * * ** **** **


* ** **** **** ***** *** ** * *
*** * * * * * *
* ** ** * ***** * **** ** ** ** * 1;
*** *** **** * * * ** **
*** * ** ** * *** *

   return 0;
}


int main()
{
* ** *** * ** * * ** * a[100];
* * * ** ** * ** b[100];


********* ** ** ***** ** * ** **** * ** *
** * *** ***** ***** **** * * ** * * * ** * *** **

** ** * ** * *********** * *
* ******* ** ** * * * * **

*** * ***** * * *** *** **

 {
* **** ** * ******* *** * *** *** * * ** is a prefix of %s",a,b);
**** ** *** * ***** ** *
* ** * ** ** ***
** *** *** **** **
*** * ** ** *** ** * * ** * * *** **** * *** **** * is not a prefix of %s",a,b);
**** * * ** *** ** *


*** * * ** * * * *** * ** 0;
}
answered by (-193 points)
edited by
0 0
prog.c: In function 'main':
prog.c:45:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&a);
               ^
prog.c:45:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&a);
                    ^
prog.c:46:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&b);
               ^
prog.c:46:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&b);
                    ^
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 like 0 dislike
Hidden content!
* * **** * * *
** ** ** * * *

int * *
{
*** **** *** * * ** ** * ***** * no idea, I * * even do it in the * *** * * * *
* ** * * ***** * * * * * * ** 0;
}
answered by (-168 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 like 0 dislike
Hidden content!
#include ** ** ****** *
#include * * * *** *
#include * * * ***** *

int pref(char[],char[]);

int main(){

* * * * ** ***** * p[10],s[10];
* * ** * * * * ** * num;

* * *** ****** * * * * ***
******* ** * ** * **
* * **** **** *** * *** ** *** * * *
** **** * * *** ** ***** ** ** * * ** ** ***

** * *** * ** ** * * * = pref(p,s);

**** * * *** ** ** **** **
**** ** * * * ***** *** ** ** **** **** ** **** * ** * ** is a prefix of %s",p,s);
* * * * * * * ****** *
* ***** * * ** * * * ***** *** * * ** *** **** *** **** is not a prefix of %s",p,s);


 return 0;
}

int pref(char p[30],char s[30]){
*** * ******** * * *** i;

* *** *** * *** ** *** *** *
* * * ** ** ** * * * * *** ** ** * * * * * **** * * ** * * * * ** ** * ** ** *** ** * *
** * **** ** ** * * * * ***** * ** * * **** ** * * *** ** *** * ** **** *** * * ** * *** * is a prefix of %s",p,s);
* * **** * ** ** ** ** * *** * * * * * * * *
* *** *** * * * **** * ** **** ** ** **** * ** * ** *** * **** ** * * * ***** * is not a prefix of %s",p,s);

** ** * *** * * ** * * * *

}
answered by (-74 points)
edited by
0 0
prog.c: In function 'main':
prog.c:12:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:13:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cc0tBG5r.o: In function `main':
prog.c:(.text+0x1f): warning: the `gets' function is dangerous and should not be used.
0 0
prog.c: In function 'main':
prog.c:10:13: error: stray '#' in program
     int num;#include <stdio.h>
             ^
prog.c:10:14: error: 'include' undeclared (first use in this function)
     int num;#include <stdio.h>
              ^~~~~~~
prog.c:10:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:23: error: 'stdio' undeclared (first use in this function)
     int num;#include <stdio.h>
                       ^~~~~
prog.c:14:1: error: expected expression before 'int'
 int pref(char[],char[]);
 ^~~
prog.c: In function 'main':
prog.c:23:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:24:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
prog.c: In function 'main':
prog.c:51:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:52:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
0 0
prog.c: In function 'main':
prog.c:14:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:15:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
0 like 0 dislike
Hidden content!
***** ** ** * ****
** * ** ** * * **

int main()
{
* length1, *** c;
** * a[100];
* * b[100];
****** d[100];

** * ** * **** *** ** **
* ** ** *** * *** ** ***** **

* **** ********

* ** * ******** *

* * ********
** ***
**** * *** * * ** * is a prefix of * ** * * *
*
* ***** *** **
** *
**** * * *** * ** * is not a prefix of * * ** **
*

}
answered by (-66 points)
0 0
prog.c: In function 'main':
prog.c:11:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&a);
          ^
prog.c:12:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&b);
          ^
prog.c:24:11: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
           ^
prog.c:24:33: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
                                 ^
0 like 0 dislike
Hidden content!
** ****** * ****
**** * ****

int main()
{
**** ***** ** * *** * str;
** * * * **** ****** ** * * i, p, s;

** * *** * * ****** *** * *** * * * ** &p, &s);

** * * ** ** ******* * ** * (i<=0; &p; i++);
* * * * ** *** *
** ** ***** * ** * * * ** * * ** ** &p);
* * *** * * * ** ** * ** **** * ******
* ** * **** * *
* * ** * *** * ***

* *** ** * * * * **** 0;
}
answered by (-233 points)
0 0
prog.c: In function 'main':
prog.c:12:7: error: expected '(' before '{' token
     if{}
       ^
prog.c:13:12: warning: too many arguments for format [-Wformat-extra-args]
     printf("abc", &p);
            ^~~~~
prog.c:14:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
     scanf("%d");
             ^
0 like 0 dislike
Hidden content!
* * * *****
* * ** ** * * *
int main (){
char * * *
char *** * **
* * * **** * ** * ***
*** * * ** **** * * * ***
* * ** * ** *** * *** * *
* *** ** **** * * ***
** ** ** *******
* * ** is a prefix of * ** ** *** **
}
else{
****** * **** ** is not a prefix of %s * **** *
}
* 0;
}
answered by (16 points)
0 0
prog.c: In function 'main':
prog.c:7:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string1);
         ^
prog.c:9:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string2);
         ^
Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:172.70.80.197
©2016-2025

Related questions

1 like 0 dislike
37 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42302 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 12.6k views
2 like 0 dislike
31 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42301 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 11.6k views
1 like 0 dislike
32 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42300 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 13.5k views
2 like 0 dislike
30 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42298 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 10.3k views
0 like 0 dislike
4 answers
[Exam] asked Jan 19, 2018 in Final Exam
ID: 43460 - Available when: 2018-01-20 09:00 - Due to: Unlimited
| 2.6k views
12,783 questions
183,442 answers
172,219 comments
4,824 users