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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** *    **  ****    **  *** *    0;
}
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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; 
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*  **   * *      **  * * ** *** len = strlen(a); 
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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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* *** * *  *   ***** **  ** 0;
}
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Hidden content!
#include **   * ** **    
#include **** * * ****   

int prefix(const char *pre, const char *str)
{

*   *** *****   * * *      **  ** * **** **** **   * *  *  
  *     *   * * ****    *** **** ***  ** * * ******* 0;
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}

int main()
{
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 **   * ***** **    *  **
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*  *    **    **  ** ** * **    ***** ***
***  *** ***  * * *  ** ****     *** ***    * ******    * * ***   * *  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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