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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***   * * * **  * *  * ** 0;
}
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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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}
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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() 
{ 
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** * *****   ** ** ** *** 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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** *   *** *  **  *** **   **  * *   * *** *  **  ****  * ****   **   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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    * ** ****  *  * **   ***    
* * * ***  * ** ***  *    *******  * ****** **   *   *  * * **  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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