1 like 0 dislike
14.8k 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 | 14.8k 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:162.159.115.32
©2016-2026

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
| 13.6k 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
| 12.8k 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
| 16.1k 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
| 11.1k 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
| 2.9k views
12,783 questions
183,442 answers
172,219 comments
4,824 users