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

int prefix (char st1[],char st2[]){
 *  *  ****    **** *  ****     len=0, i, cnt=0;
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*  * *  *  ** *  * ***    *  * **** 0;
}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
** * ***** ** **** *  ** ***  **** ***    * 
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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];

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** ** ** * *    ** ** ****  * = 0; i < len; i++)
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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++) 
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**    * **   ***  * *** ** *** * * * **   ** *    * * ****** * *  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);
  ****  *   **  *   *   *** *  ** * *    *  ** ** * *** ** ****  *  *     * * *  *  *** 
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* * **** ***  ****  * ** * **  **** * **   **** **  ** *        ***  * 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;
** * *   **** *   * ****  * ***** *   * *   ** 
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    * **  ** ** * * * * *   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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