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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int main(void)
{
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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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* *     *  * *  *  **  *  
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}

int main(void) {
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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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}
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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++)
** *****    * * * *    **** * *
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*  ****  * ** **   *            **   *      ***   *
    **   **** * * ** ***  *        * ****** ***    * * * *    ** ********   *   ***  *   ** = 0;

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**   *    ** * * *  **** * * *  * ** * *******   *
 * **  **    *  **   ** **  
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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]) 
 * **   *  ** **  **  *   *** * *  *  ** * * ***        
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 * **   **     * * * **  *  *   
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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);
* ***   ***  ****   * * ** * ****   *  * *** * *   *        *** ****   **   *  *  * ** * 
* * ** * ***   *  **   ***        * ***    *** 

 ** **  * ** **  *  * **** *  
**** ** *** *    **    *******    == 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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