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;
 int count=0;
 
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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()
{
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  *  *  *  ** *     *  ***** ** ** * b[100];

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** *      ** *     ****** *  len = strlen(a);

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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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 ** *   ****** *   *    ** ****  len = strlen(a); 
**  ** * ** *     * *  **     ** = 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];
 *** **   * *** **  **   ******** i,j,prefix = 1;
**** * **   * ** ** ***    * * *   * ** * * ** %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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