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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* *  ***      *** **   **   * *   = 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; 
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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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0 0
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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 * * *** * ***   *** ** *  ***   *  *    **  *    * * *  *****  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;
*   ***  * *** * *  *   **     * *******  ***  *****  
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* ***     *****  ** ********     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;
 * * ***     ***    * *** * 
   *** **  ***   *** *    
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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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