1 like 0 dislike

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
Available when: 2018-01-17 14:00 - Due to: Unlimited

retagged by | 42 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 (-153 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 (-403 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 (-62 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);
         ^
Get it on Google Play Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:162.158.79.71
©2016-2019

Related questions

1 like 0 dislike
37 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 61 views
2 like 0 dislike
31 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 33 views
1 like 0 dislike
32 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 93 views
2 like 0 dislike
30 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 58 views
0 like 0 dislike
4 answers
[Exam] asked Jan 19, 2018 in Final Exam
Available when: 2018-01-20 09:00 - Due to: Unlimited
| 20 views
8,735 questions
71,258 answers
45,934 comments
1,859 users