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[]){
*  * **  *  ** *  **   *      len=0, i, cnt=0;
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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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 ***    ** * **  * **   *****  ** **  **    **   *  ****  ** *     is a prefix of %s",a,b); 

 
    *  **  * ****  **      *****  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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     **  **  *****  ** * **   len = strlen(a);
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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)
{

    *  * *** * *    *  * *  **  * * * * *** * *  *  *
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   **** *  * **  *  * *    * * * return 0;


}

int main()
{
* *** * *   *   **  **     pre[100],str[100];
* **  ****** * ****** * 
*   *  *  **    *  **      *      **********    *
* *  * ***   *   **  *******   * ** *
  **** * *   ** **  ** *   **  **  ***    *  *  ***    ** * *** *  * 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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