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!
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char prefix(char s1[], char s2[])
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Hidden content!
#include **   ** ****    
#include  *  *    ** ** *

int prefix (char st1[],char st2[]){
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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* **  *** *      ****   *      *
}
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Hidden content!
#include *   *  ******  
#include **  *     *   *  

int main() 
{ 
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}
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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)
{

* *****   * *  ***  *      * * * * *  **    
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}

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;
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***    *** * *  *  **** *   ******** **  *   **  **   **
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    }
}

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;
     ** ***** *    *   **  ****   **  
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   *  * *   * **  *      **  *     * *   **  %s",p,s);
 ** * * *   * ***  * * * * * *   
*** **  ** ** ** **** * *  ***  *  *
**   * ** *  **     * **  *    *  *** **
  ***   *** * ***** *** ***** * **  *   
*** *****  *  ** * **** *  *   ***** **    *
   ** **   *  * *   * **  *   *  *  ***       * ***   **** *****  is a prefix of %s",p,s);
*  **  * * *** * ****  **  **
**  ** **** ***   ***** ***   * *  
* **** ******  ****  *  *  *     *   ** ****  * * *     **   * is not a prefix of %s",p,s);
*** ******* **  * ** *      *   
**    *  * *   * ***** **   *** **  0;
}
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