1-11 Exercise 3: Prefix of a string

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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

 

[Exercise] Coding (C) - asked in Chapter 13: Strings by (12.1k points)
ID: 41439 - Available when: Unlimited - Due to: Unlimited
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27 Answers

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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
**      **       *  * *  ***   n[999],str[999];
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 * ** ******* ***   * ***** ** **    * *  ******* *  
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}
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prog.c: In function 'main':
prog.c:9:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t {aka long unsigned int}' [-Wformat=]
     printf("%d",strlen(n));
              ^
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prog.c: In function 'main':
prog.c:9:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t {aka long unsigned int}' [-Wformat=]
     printf("%d",strlen(n));
              ^
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Case 0: Correct output
Case 1: Correct output
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Hidden content!
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int main()
{
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return 0;

 }


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 *** *    **     ** ** *     ***


}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
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    }
}
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Case 0: Correct output
Case 1: Correct output
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0 0
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Case 0: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

**** ** *  ** ** *     **      * a[100],b[100],c[100];
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    }
}
answered by (-329 points)
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prog.c: In function 'main':
prog.c:8:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
             ^
prog.c:8:15: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
               ^
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:7:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
             ^
prog.c:7:15: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
               ^
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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Hidden content!
#include * **   * *  * ** 
#include  *    * *    *
#include   ****** * ***

int main()
{
*  * *******  * *  *      * ***    prefix[100];
  * * *** ****  *** ** **  * ** word[100];
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***  **  ** ********** *  * i;
* ** **** ***    *  *  ******* *  ** * = 0; i< strlen(prefix); ++i)
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**  **  *  * ** *      *   * * ** *******  ***   *****    *    **** *   ***  * *  *** * ***  **   is not a prefix of %s", prefix, word);
** *   **   *** *  * ** *   ** *****       ***** ** *    *   *  **   *    *  * ** 0;
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**    * *** *  ** * **    ** * ** is a prefix of %s", prefix, word);
 ****    ***   *   *  * *   *   ** 0;
}
answered
edited by
0 0
prog.c: In function 'main':
prog.c:15:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
prog.c:17:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:15:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
prog.c:17:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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Hidden content!
#include  *  **  ***** 
#include        * *  * 

int main(){
 ** * *** ** **    *******  * * *  p[100],s[100];
   ** * ** ** *  ***** * * * ******** ***** ** ***  * ***  * *
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* *  **  ***   **  *  * * **** ***

*  * ***      **      **   * *    *      is a prefix of %s",p,s);
* *        *     **   **  * * **** **** **     is not a prefix of  **** * *
    *  ***     ** *     * *** 0;
}
answered by (-116 points)
0 0
prog.c: In function 'main':
prog.c:5:5: 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:6:5: 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__;
              ^~~~
prog.c:8:19: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(int i=0;i<strlen(p);i++){
                   ^~~~~~
prog.c:8:19: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:8:19: note: include '<string.h>' or provide a declaration of 'strlen'
/tmp/cclwPOj6.o: In function `main':
prog.c:(.text+0x26): warning: the `gets' function is dangerous and should not be used.
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prog.c: In function 'main':
prog.c:8:19: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(int i=0;i<strlen(p);i++){
                   ^~~~~~
prog.c:8:19: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:8:19: note: include '<string.h>' or provide a declaration of 'strlen'
commented by (4.3k points)
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0 0
-----------Re-judge-----------
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
   *   * **    **  ** * *   * ** i,count=0;
 ***    **** *****  *  ** ** *    ** * string1[100];
* * * *     **** * ***** * * string2[100];
**    ** ** **         *   *   *   **  *****  
      **  * *** *** ** *** ***  ******** ***** ****

 **   **  *   *  *    *   ***    ** * ***  *  *
**  *  *  ** **  ** ***  * *
  ** *  **** * * * ** * * *  ***     *  *   * * * *** *  *******
     ***   *  * **   **  *    ****  *  *  ** *   **
* **   **  * *****   *   *   * *  ******  *  **   * * *   *  ****  **   ***** **
** * ** * ** ** ****** ************  ** ****     ** *
    }
 *  * *   * ** *  *  ***        ****
 * ***  *** * **   ***     
  *  **** *   *     * ***   * *   *  ** *  ******* * ****     *   ** *    is a prefix of %s",string1,string2);
  * *  *   **    ** *   ** 
**  *  *  * **   *    *****
 *    *   ** *** *   * * * ***  
 *    **** * *  *  *   *  *      *        *    *** ****** ** *** *  * is not a prefix of %s",string1,string2);
 ********  **    ** *   
**    *    *  * * * **** * ***  0;
}
answered by (-323 points)
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prog.c: In function 'main':
prog.c:9:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(string1);
     ^~~~
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:10:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(string2);
     ^~~~
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/ccIBxtbQ.o: In function `main':
prog.c:(.text+0x2f): warning: the `gets' function is dangerous and should not be used.
commented by (4.3k points)
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Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
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0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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