1 like 0 dislike
4.9k 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 | 4.9k 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:172.70.131.119
©2016-2024

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
| 5k 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
| 4.4k 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
| 4.7k 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
| 3.7k 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
| 943 views
12,783 questions
183,443 answers
172,219 comments
4,824 users