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;
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}
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Hidden content!
#include ***** **   ** * **
#include  * ****     *  ** 

int prefix (char st1[],char st2[]){
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}
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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()
{
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 ******   * *   *    * *  ****** * ** b[100];

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

int main() 
{ 
 * *    **       ** *  ** * a[100],b[100]; 
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***     *  ** *** * **** * ***  len = strlen(a); 
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* ** * **  * ***** ***   * *** *  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];
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**  * * * * *   * *** * * ****** ** *  %s",a,b);
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 * *   **  **  *   *** *      * * **  * * **** * **  *    

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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];
  *  ***  ** ***   
*   * *** * * **    ** *** *               * ** *** *
*     *        * * * *** * ****   **  *
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  * *  ** ****  * * *** **  
 * ******* ** ** ****     * * *  ***** ***  *   *** *  *    **   * 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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