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;
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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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**** ** *     *    * **  *   *  *  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() 
{ 
  **      ** * **    *  ** ****  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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     * *** ****   ** * **  ***     * 0;
}
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Hidden content!
#include ***** **  ****** 
#include   **   *   ** **  *

int prefix(const char *pre, const char *str)
{

  *     *  ** * *  **  * *       *  *** **    
   *    **    * ***  ** *   ******       *  * ***** * *   0;
 * **     **  ****  *** ****  ** ***  ** **   ** * *****
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 **** *    *****    *  * **   return 0;


}

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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 * *** ********* **   *  **** * * *      *** **  *  ** ** 
* * *  ********* **  ** ****  ***  **   *  *  *    * ** * * **** 1;
    }
}

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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