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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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()
{
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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)
{

  *    ** *      *  ** *   **    *    **  **  * 
  ** * * **  ** * ** *     ** * *    *  **   *   *** * * * *** 0;
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}

int main()
{
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 ** *   * * * *  **
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***   * ** ***** ****  *  *          ***  
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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;
     *** *   * *   *    * **
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 ***   *** **** *  * *  ****  *  ****  *    * *   * *   *** * *  **   * ***  ** * **     **   
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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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