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

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