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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}
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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]; 
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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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***** **       ** * *  *  * * *    ** * * *   ****** **  **        **  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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 ** *****  ******** ******  * **  *** **  
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}

int main()
{
***    ***      *  **** **   pre[100],str[100];
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 * *   ****    *** ** ****   * ** * * **  ****** *
*  ** * *   ** * ** *    *** **  *  *    *
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 ** ***  **   * **  * * ***  * 
      *  *** *      * **   *** **   ** * **  **  **  *  * * ***   * *   *** * ** 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;
** *** * *    ***      ***** **  *  *  **** 
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*  **   *       **** *  **
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  *    **   *   ****  * * *  * ******  *  ***  * *        *****    ****      *   *    *  **
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  * *  ** * ** **  **  ***** *        *** * ***     ** 
**  ***   * * **  **      *   ** *   **           **   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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