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)
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Hidden content!
#include **  ** * *
#include ****** * ** *****

char prefix(char s1[], char s2[])
 {
 int i;
 int length;
 int count=0;
 
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*  *   *   ****** **  ** *  ** 
 
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 }

int main(void)
{
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*  ***  * * ***** *    * *  **
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*    * ** **** **  ***  **   * 0;
}
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Hidden content!
#include *  ***** ** *****
#include      * **  * *    

int prefix (char st1[],char st2[]){
  ** **  *      *   *   ** *** len=0, i, cnt=0;
***  ** * ** **** **** **
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***  * **  **  *    ***
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*     **     *  *** *  * 
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*  ** *       ** ***      *
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** *   ****** *   * **   *   
}

int main(void) {
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*  * ** **  ** * ****** *   **   (prefix(st1,st2)){
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**** * **** *   **     *  * *
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*** ** *  ***  ** ** *  * ** ** **  *  * **    *    * is not a prefix of %s", st1, st2);

**   ** ** **  * *  **** * * *  *   0;
}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
*** **** ***   **     ***** ** ** *** ******  *
    scanf("%s",b);
    j=strlen(a);
    for(i=0;i<j;i++)
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 * * ** * * ******    * **** *  **  ***  * ** * ****   *****  ** * *    * * ***** ********   *    *  * * *** *      *
 * *    *   *    **  *     **  ** ** *  **** ******  




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

int main(void)
{
    char pre[100], str[100];
    int i;
** ** *  **  **   *        *  ****** *** *** *** * 
***  ** **  ** ** *  **** *    ***     ****** **

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

 *  ** *  *  *  * *     *  0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
    * * **  *        * ***  a[100];

* * **  * *      *** **     **** * b[100];

 **      *  * * **** ** ***  * *   i = 0;

**** ** **  ** ******  * *   prefix = 1;

**   *  ** ** * ***  *   ***      **** *  ******** a, b);

*** * ** *** *    *    *  ***  len = strlen(a);

     *   *** **    * * = 0; i < len; i++)
 * *  *** ** **  *   ** ** ** 
***** * * *   *  * *  * *   *  **  **** **** *** *   *     != b[i])
*  ***    ** * * * *    *   * * ** * **   *    ** *  **
* **** * * * *  ** *   *** ****  ***  ***  *  **   ** ** * *    *    *  ***  **** **   = 0;

** ** * ***** *** ** ***  ***   *** **** * ** * * *     *  *    *  * *  *******  *          is not a prefix of %s", a, b);

***    *** * **  *     * **   *    *  **  * ** * *   *** ** *      *   ****** *  ** **
**** * **  * *  **  *  * *** *  * * ** * *    * * ** **  
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 **     **    **  * * * **
*  * ***** *    *******  *       * **   ** *  **   ** **   *  ** * is a prefix of %s", a, b);

* **** ** **    **  **  * ** * ***
}
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Hidden content!
#include **** *   *  *  
#include *****  **** ***  

int main() 
{ 
* *********    ***** ** ***    * * a[100],b[100]; 
** ****** *    ***  ********    * i,j,prefix = 1; 
 * *  ** **** **    ** *  ** * * * * *  %s",a,b); 
** *           **** * *** * * len = strlen(a); 
**  **    **   *** *  * **    * = 0 ; i < len ; i++) 
 ** ***      **  * *  *  
** **  **  ** **** **    * * **  *   *  * **  ** *   ** * *  != b[i]) 
 *** ** * *  **    ** ***** * **   ***   * **    *  *   
*   *****    * ****   ***  *  * * **** * *   * *** * **   * *  ****     *****    **** * ** ** * * = 0; 
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*  * **** * ** * *  **  *   *  *    **   * * **** *** *  

    ********* ** ***** *   
 **        * * ***** ** *  *  *****  == 1) 
  ******  ****    ****     *     *  *   ***** **** * ***   ***  * is a prefix of %s",a,b); 

 
** *   **  * **       *      0; 
}
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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Hidden content!
#include <stdio.h>
#include **   * ****  
#include **  * * *** *** 

int main()
{
**** *     *  **  *    *  * * a[100],b[100];
* * *** ************        i,j,prefix = 1;
  * *  *   **** ***  *  ** ** * **** * %s",a,b);
***  **** *   **  **      ***     len = strlen(a);
*   ******   *    *  *     *** * * * = 0 ; i < len ; i++)
*  ** * **** **  *  ****   
*     **  * **  * **   ** *** * *   *  *** *  *  * *  != b[i])
 **  **  *  **   * **** *  * * **** *  **  * ****    *
*  * ***      *  ** ** ** *         * **  ****   ***      ****  *     *    * * * *   * * = 0;
          *** ** * ** ***  *     * *** ****   * * ** * **** ***** *  ** **** *  **** *  * **  is not a prefix of %s",a,b);
     **   * **  *  ** **   *********** * *    * * ** ***  **    *** *         *   
**   ** *** *   *    *   *****       * ** *  * ** *

 *    *         *    *  
**** *** * ******  ** ** * *  ** * * * == 1)
  ** ***    * * *  *** *****   ****  **  *  *       *  ***   *  ** is a prefix of %s",a,b);


  ****  * ****     ******  *  *** 0;
}
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Hidden content!
#include * *** **** * ** * 
#include ** * * *  **  

int prefix(const char *pre, const char *str)
{

***   *** *    *  ***  ****  ** ***    *
* ** **********   ****  **** **   *  * * **  * *    **  0;
** *  *       * *  * ***  *      **** **** **    *    
*    ** * ****  ** ** * *  * *      * ***  **      *       1;
* * *  * ****  ** * ***   return 0;


}

int main()
{
**  * *   * *** * **     *   * pre[100],str[100];
 ***  ***  * * * * 
 ***  * ** *  ***** *    ** *   ** **   **  *   *   
*  *  *****  **** *  ** *   **  **** * **
** *** *  * **     * * ***     * *    *    **  **  *** ***** *** *  is a prefix of %s",pre,str);
** ***********     **  *       * *
* ** * *        * **   *** ***       *   ******   **    * **  *  *  ** is not a prefix of %s",pre,str);
* * *** * *** * **   **      0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
 ** *     ** *** **** * *** * c;
**  * *  * *** **  *** ** *   * **   ** *
 *  *     * **   *****     * *  *  * *** * *  *  *******   * *** 0;
** * **** *********** **  ** *  * 
** *  ** *      **** *   ******  *
  *  *  *  * *** *** * *  **  ** ***   ***   ***  *** **    *   *****   **  * **  *  of a string
  * **  *    *   *** * *  * * * * **      * *  * ** *** ** * ****    *** *** *  * **    
 ** *   **   *  *******  * **    *** * ***   *  ***** *   ** **   ** **  * **   *  * *   ** ***** *** *******  **** * * **** * 0;
*    ****  *  * ***  * ********** * *   *  *     *** 
 * *  ** **  ** ***     **   ****  ** ** * *   *  **    *  * 1;
    }
}

int main(){
***** **   ** * ******** *  *  * a[100],b[100];
****  ***   *** **  * ** * *  * * %s",a,b);
  * ****  *** *     **** * ** ***    
 ** ****  * **  *   *   ** *    *     *   **     ****        **   * ****  is a prefix of %s",a,b);
   *  ** * *** *    **  *** 
* * ** ** * *   *****  ********* *****  * * *          * *    **      is not a prefix of %s",a,b);
 **   **  * *****  * *** * *  * * *   0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>
int main()
{
***********          *  * **  **** p[100],s[100],a[100]={};
**    * **  *  **   **** ** **   t;
****   **** *****   *   * *  *   * *  *
* *  * **   *       **    ** * *** ****
 *   * ****      ***  * ***  *  *** *  * ** %s",p,s);
*  ****    **  *  * *    ****  *** * **
*****   * **  *  * *    *** ** 
  * *   ***  ** *  * ** * ** *   ***
*   *  * *    ***    * ** * ** **** * ***  *  *
 **  ***   ** *   ******* *  * **  *  
***  **    * * ****  ** ** * ***   **  *     **  ***  **  ** ** *    is a prefix of %s",p,s);
  *    ****** *  * ***  ** *
  ****  *   ** *** ** *
  *  ** * *     **** ** *** *  * *   * *   ** ***   * ***  * * **  * is not a prefix of %s",p,s);
 **   * **  ******    
 *  **     ***  *    **      * 0;
}
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