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

int main(void)
{
    char pre[100], str[100];
    int i;
 **       *   ***** *  **  * ***** *** ** *** *    *  
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*  ** *      * ****** *    * *  ** *     **  * *****  *** * ***** ** ***    * * *
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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; 
*  ** ******** *** *   ***   ** **  *     **  * **** ** ***  * * *    ** * ** * **   *  * * is not a prefix of %s",a,b); 
* * *** **   ***   *  *** **   **     *  * * ** *    *** ** **    * *** **   * ** 
 ***   ****   * *  **  **  *   * ** *  *  *  ** *** 

**    ****   *  ***  *   
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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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