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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*    *       ** **   * * *   *    **   ** * ***   *  *
   ***  ******  **     *      **** 0;
}
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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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Hidden content!
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int main()
{
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return 0;

 }


if (i==plen-1)
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**  *   **  *    ****  


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

int main() {
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 ** **   **    * **  ***   * * i=0,re=0,len;

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    }
}
answered by (-120 points)
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Case 0: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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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)
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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
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0 0
-----------Re-judge-----------
Case 0: Correct output
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Case 2: Correct output
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Hidden content!
#include   * *     *   
#include    ** * * ** *** *
#include    ** *** *  ***  

int main()
{
  *  ***   *  ****      * **** *  prefix[100];
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*** **  *    **** * **  **  * ** * ** %s", prefix, word);
*** ***  *****  ** ****** ***  i;
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* * ** ***   *******    **
  * **     * *    * * **  ** **  **       is a prefix of %s", prefix, word);
  ***   * **** **   ***  * *   0;
}
answered
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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)
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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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0 0
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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-----------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;
}
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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.
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
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Case 1: Correct output
Case 2: Correct output
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