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()
{
    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()
{
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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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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()
{
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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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*  * *   *** **   * *  * ** return 0;


}

int main()
{
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**    ** * ***   * *  *  
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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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    }
}

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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