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;
 int count=0;
 
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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()
{
**   *** ***  *** ***  *     * a[100];

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

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