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[]){
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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];

 *  **   *  **    ***   *  *  ***  b[100];

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

int main() 
{ 
    *    * **   * **    *    a[100],b[100]; 
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 * ** **** ******  ** ** len = strlen(a); 
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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];
*    * ** * * **** ****** *   i,j,prefix = 1;
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 * * *  **   **** *** * * len = strlen(a);
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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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**** *  **     *   ******  *  *   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;
***   ***** *   *     *
** * *  ***  *     ***  ** ****
 *    *  *  * ** *   ** *  * ***   **     **    *** ** ** * *****   **   ***  *** of a string
* * **   * **** **  * *****   *** ** *   *  * *  * *    * *   * ***    **  *  ** * *   **   ** 
* **    * ** ****  * * *   *    ** ***   ** *  *  *    * **** **** **  * *    ** *  *  ***    ***  *    0;
***  *  *    *  *** ** **  *   * **   **  *   * * ******* 
*** **    *  *** *   * * * * * *  ** *  * ** *   *** * * 1;
    }
}

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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