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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}
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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];
  * **  ******* **** * **  **   *** *       *  *
    scanf("%s",b);
    j=strlen(a);
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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;

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

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