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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 **** *         *     ** * **    *    *  ***** * * ***** ****** ** *    ***    **   ***  *

 **    **   * ** **** **   *     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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**  ***    ***      * * * **  * ***  %s",a,b);
** *   * ***    **     * ** *    len = strlen(a);
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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()
{
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 *      **  ** *    
*   **  *   *    *   ***  * ** ** ** ***  * 
 *   *** ** *  *    *  * *   * *  *
 ** ** **  ** **** ** * * * * *  ** * ** *  *   ** **    *   is a prefix of %s",pre,str);
* * ***** *  * **   **  *  
  ** *******       * * ** **** *  **  ** * *   * *  **** ** *  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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 ** *  * *   *** **  ** ** **  * *    ***     *   ***    *** * **  ***  ***  ** *   ** ****  ***** * *  * * *** 0;
* * ***  **  * *** * *   *  *      ** **  **   ****   * *
* **  ** * * **   *   ** ** *  * * * *  *   *  ******     ***  *  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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