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[])
 {
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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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 *    *****  *    * *  **  *  
}
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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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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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** * ***** **   *** **     *** **   *   * *  ****  
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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;
  ** *    * *** **     * 
*   * **    ** * *   * *  * *   *
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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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