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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*****  *   **  *** * * * *  * *  *      ** * * * **
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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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Hidden content!
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{
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return 0;

 }


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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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Case 0: Correct output
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Case 2: 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)
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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);
               ^
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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
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Hidden content!
#include   * *** * **** **
#include ****       *** 
#include *   *****  ****

int main()
{
  *    *   *  ***  ***  * * prefix[100];
*   **   *** *    * **  ***** *   word[100];
**       * ***    * **   **  **  *  * %s", prefix, word);
 **  *     **** *** * **     *  ** i;
**  *** ** *   *********  * ** = 0; i< strlen(prefix); ++i)
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   *     * * ** ***** *** * ** **  *  **  ******* *   *  ** *  * ** *      *   * ** **   0;
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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)
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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 2: Correct output
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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'
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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: Wrong output
Case 1: Wrong output
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Case 0: Correct output
Case 1: Correct output
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-----------Re-judge-----------
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