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];

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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 ; i < len ; i++) 
***  * * **   *    * * ** *  
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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);
  **  **  *****  * * **   *    len = strlen(a);
 *  **     ***    *  ***** = 0 ; i < len ; i++)
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 ** * *** * **  *  ***  *  * ** *  * *****    * 
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   * **  *  * ********* * ** ****   ******* **   ** ** *  *  **   *** * **  **  ** **** ** 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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