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;
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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()
{
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*    *  *   * *  *  ** *    * * 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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*  **     **  ** * ** ***   ** *  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];
** **** **  ** *** 
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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;
*   ***    **              * *  * *   *** **   **  
  *  ** *  *  *   **  ***  **   *  *  *     **  *    **  0;
*   * ** *  ***   ** *   ** *
 ** **   *** *   *  **  *  *
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  * ***  **  **    ****** **  ***    ***   * *** * **   ** **
*  *        * *******  *  **  ****       *****  * ****   * * 1;
    }
}

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