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   ****  ** *  * ** 
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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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}
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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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    int i;
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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()
{
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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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 *** ******  **   ** ***** **   * * **  **    *  * 
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    }
}

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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