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

 

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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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}

int main(void) {
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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;

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

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

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

**  *  ** * ** * *  ** **   * = 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;
*   **** **** * *   * **  * *  *  ******* ** *  * * 
  **** ***    ** * * **    **     * * *  * * ** * *** 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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