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

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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; 
   *   *  * ****  *****  * ** ** ** %s",a,b); 
 **** *  *      ** *  * * **** **  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);
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 * * * *  **    * *   * **
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 **  *** **** ** *   * **  ***   ******* *   * **  **  
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**  * ***  ** * ********   * ****  **  *    ** *  *        ** **  *   * *     * * ** * *** *  
  *  * *  *       * *  * * ** *  ** *   ***     **** * 

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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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