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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***    **   *     **       **  ***  0;
}
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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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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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 * ** * * ***   ***  *  *   **** *   *   *** * ***   ***   ** *** 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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 ** * *      *   **   * ** * *  * ** ** *** ****    ** 1;
** *  * * **  * **     **    * 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;
  **    *** **  *  *   * *  
***  *    *   * *  **  ******** * * *
***  *   ** *     **  * ***  * * * * ***  *   * * **  **  *  *** * ***** ***  **     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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