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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}
answered by (-281 points)
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Hidden content!
#include <stdio.h>
#include <string.h>

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

 *          *     ** **  ** *** 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); 
***   **** *  **** * * **     len = strlen(a); 
 **  *  **   * *  ** ** * *   * *  = 0 ; i < len ; i++) 
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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;
* * **   **** **   *  *****  *******    * * %s",a,b);
*** *** *  ***        * * *   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;
   *  **  *** *       *  
 ** ***  ****  *   *   **  ***
**   *** * *  * **** *   ********* *   ****  **  ***** * * *  * *   ** ****  * 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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