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[])
 {
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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]; 
 *   ****   *   **  *    * i,j,prefix = 1; 
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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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   *  **   *** * **   ***    ** *  * *** ****   *** **  **          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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 *  * ** **** * ***** *  ***   **** * * * ** *
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 * *  ** ** **  ** **  ***** * return 0;


}

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

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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