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;
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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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**   *  * *** **   **** 
}
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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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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];
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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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**  **** **  ***  * *****  *****
 ***    ***  *    * ** ** * *  ****  * **  * **   ** *****     **    ***  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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   *  ******* * *****   *** ** * * *   ** **** 
*    ***  ***  ** ** * *   ***    *   **   ** **         ** 1;
    }
}

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