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

int prefix (char st1[],char st2[]){
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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()
{
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*     ***   *****  * *  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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  *** *********   * *      *   *  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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 *   **** **    **  * *       *** **  %s",a,b);
*   * *  * *   ******** * *  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)
{

*          ***** ** ** **   * **   *  * 
 **  * *** **** *  *   *** * **  *   **   *** * * **  * 0;
*  ** ******* ** *   ***  **  * *****  *****   
** *     ***  *   ** ***    *  ***   * ** **  **      *    *** 1;
* *  * *   * ****  *  *   * *  return 0;


}

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