1 like 0 dislike
8.6k 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 | 8.6k 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:172.70.178.23
©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
| 8.9k 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
| 7.8k 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
| 9k 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
| 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
| 1.7k views
12,783 questions
183,442 answers
172,219 comments
4,824 users