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];

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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];
 **** *   ***** **    **** *  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)
{

*** * *   *****   ** *  *  **   **          ** ** **
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  *   * *** * * *  *    ** *     **       **      * *
 * * * * * * *  ** * ** *  **** ***   ** ****    **   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];
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 * * *  * **  **   **  **     *  ** 
 * ** *  *** *          *** *   * * ***    **  * * *  * * ***  * * * 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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