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()
{
*   **** * *   ** *** ***  ** a[100];

* * *  ** **     * ***** *  b[100];

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

int main() 
{ 
* * * * *** *** * ***  ***  a[100],b[100]; 
  **  * * ****    *  ***  *      i,j,prefix = 1; 
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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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** * *   *  **    ** **     len = strlen(a);
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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)
{

*  * * **       * ** **  * *       * **   * ** *  **
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*      *    ***  ***    **  *** return 0;


}

int main()
{
* **  *** * *  *  * *  ** *    *   pre[100],str[100];
*  * * * * *  ** *    
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**  * *  *  *  * **** **         * 
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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;
 ***  * ***  *** ** * **
  ****     **** * *** ***** *
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* **  ** ********   ***** * ** * *         ** *  **** ***  *  *   **    ***  * **  ***  *   *   * **** ****     *     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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