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!
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#include *     * * * ****    

char prefix(char s1[], char s2[])
 {
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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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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   *   **    *  * * ** *  * **
}
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Hidden content!
#include ** ** *   *  *  * ** 
#include * ** * ** ******   

int main() 
{ 
 *  *   ****    **** * ***    * a[100],b[100]; 
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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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0 0
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;
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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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** *   **  ***  **  ****   ** 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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 * **     *******  ** ** ***  *    ** *  ** * * * *   ** * * ***** **    *  *** ** *     *
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 *    ***  ** *   ** ****  ***** * * *** ****     *** 
 *    * * ** **     *   *  *   *     *  * * * *  *    * *  1;
    }
}

int main(){
   **   *   ****  **   *  *  a[100],b[100];
*  *** * **  *** *   *  **** ******    *  ** %s",a,b);
  **  * *         ******** ***   * **  * *
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     *  ** *** *    *    **
     * **     ***    * **  ***  * *   *****  * * ** **    *** * *   **  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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