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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}
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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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* * * ***  ** ** *** *** ***  *  = 0; i < len; i++)
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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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 *  ** * * * **  **  ***  *     len = strlen(a);
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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()
{
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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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   * **   *  *  *  *  **   ** **   *
**    ******* *   * ***** *  ** *** *   **  **  * ** *   ** **  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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