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]; 
*   ** *  * ** *** * ***   *  * i,j,prefix = 1; 
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 *   ** * ***** ***  *  **  = 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);
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** *  *** **   *** *      ** **** 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()
{
*  ***      * ****   * *  *** *  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;
 *  *****  *  * **** **  
 ** ***  *** *  *** **** 
  * ** *  *     **     **** *     ** *******  ***    **  **    *   **** * *  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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