1 like 0 dislike
15.9k 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 | 15.9k 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:104.23.243.43
©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
| 14.4k 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
| 13.6k 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
| 17k 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
| 11.7k 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
| 3k views
12,783 questions
183,442 answers
172,219 comments
4,824 users