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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#include *    **** *

char prefix(char s1[], char s2[])
 {
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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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  ** *    **   **    ***  **  
}
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Hidden content!
#include      ** ** **  
#include   *  * *  *  **   

int main() 
{ 
*****  * *** * ** **** *   *  a[100],b[100]; 
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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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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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 * **  ****    *  * ** **  **     * * * **  *  * **
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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()
{
 ****   **** **     *** *  **  pre[100],str[100];
*  *  * ** * *      **
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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
 ** * ***  ** *  **  **  * ***** *     *  *** ** * *** * **  ***  **  ** ** *    *   ****
****    * ***  **  ***** *   ***   *    *        *** * *** **  **  **  ****  ***** * *****    ******   ****** 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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