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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#include   * * ***   *   * * 

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