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;
 int count=0;
 
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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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*  *       ****   **** * ***   **** 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

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

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 **  * ***  ** * ** **** * **      *  **  * *******     *  is a prefix of %s", a, b);

 * **** **   **   ***  ** *
}
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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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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()
{
**    **    * *  **** * *   ** *   a[100],b[100];
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 **  * *** **   * **** * **   *   * *** %s",a,b);
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* * ** **   **   ***  * **   **  *  * ***  * **  * * *
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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)
{

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


}

int main()
{
     ******** ** * * *  **  pre[100],str[100];
** **  * *** * *  * 
** **   ** *     * * *   **  ***   ****    *  * 
 **    ** **   *  *   * **  *  *** ** *  **
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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;
* **     * * ****  ***      
*  ** *** *    ** *   **** *  * *  
**  * *   *** *    **  ** *  ** *** *  ***  **  *** * * **     * ** ** ********  of a string
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 ***   * ** **  *** *   **    *   * * * ***  * **  *
    ************ *    *   *    * *  ** *   * **      ** **** ****   1;
    }
}

int main(){
*    *  *     * ** **   * **    a[100],b[100];
  * **  * *** *  ***   * *      ***    *** %s",a,b);
* **  *** *    * * ***  **  ** * * 
*** ** **  ** *   * * *    ***     * *** * *  * **    *****   ******   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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