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

int main()
{
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*  **    **  * **  **  ** * **  b[100];

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    ** *   ***  *****   *     *
}
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Hidden content!
#include     * * *** ***  
#include    *   *  * ***   *  

int main() 
{ 
***** * *****  ** * ** a[100],b[100]; 
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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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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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 ****    ** ***  * * ***** len = strlen(a);
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 *    *  * *  *  *     * *   *
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 ***   **  *  *  **  *     ****   * ** ***  *   ***   *  *   ** * is a prefix of %s",a,b);


  * **  *** ****        ***   ** *** 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;
* *  *    ***     *  **  ** *   * **  ** * *  
*  * *****   * * *  *  **      *  **  *  * ***  **** *   ** 0;
   **   * * *  *  * *****   ***    *
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 **  *  *  *  **    *** *** ******  * *  * * * *    * ***  *        of a string
 * ****  *  * ** *      ***  ** * ** **   *   ** ***  ***     * **   *  *  *    ** ****
* ***  *  ****   * * * *   *   **   ** ****    *    * * * **  * *  * *   *   * * ** **  *    * *   **** *        *  ** 0;
****   * *  ** *** * ***  * *   ****    * ****     ** *
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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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