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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 *** **** ** ***    * *  b[100];

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* *   **  **  * ***** **
}
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Hidden content!
#include   *     *   * *** 
#include  ***     * * 

int main() 
{ 
 **   ****** *       *  ****   a[100],b[100]; 
**  *  ** *   ** *  *** **  * * i,j,prefix = 1; 
**** ***  ***  *    ****** * *** * *  * %s",a,b); 
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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];
 * **    * *  **   *   ******  i,j,prefix = 1;
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*       * ********** *   ** * **   *   len = strlen(a);
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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;
 *  * * ***     * ** * * *  ***  **  **
** * * ****   *   **  *** ** **** **  * ** ** *  **   ** 1;
***** *    * *****    *     return 0;


}

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