1 like 0 dislike
8.1k 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 | 8.1k 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:172.69.17.163
©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
| 8.4k 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
| 7.3k 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
| 8.4k 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
| 6.5k 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
| 1.6k views
12,783 questions
183,442 answers
172,219 comments
4,824 users