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