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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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() {
**    * ***  * ******  ** * *  p[1000],s[1000];
**   ****** ** **** *  * i=0,re=0,len;

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    }
}
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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)
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
commented by (4.3k points)
0 0
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Case 0: Correct output
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Case 2: Correct output
commented by (4.3k points)
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Hidden content!
#include  *** *    * *  
#include ** **** ****    
#include ** ** * * **** * 

int main()
{
* * *   *  *  *******   *    prefix[100];
  *   * **  * * *   * ** * *** word[100];
** * ** **   ** ** *   *  **    * %s", prefix, word);
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 * *   *   **** ********   **  *     ****    **   *****  *  * *  ***   ** ***  * *  *      **  *  is not a prefix of %s", prefix, word);
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**  * * * *  * **    * **  **** *  * ******  * * ***  *
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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)
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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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***  **  **  ********* **  *    *   **  *  *  * * 
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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'
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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 1: Wrong output
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
Case 0: Correct output
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