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!
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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()
{
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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()
{
*  ********      *  * pre[100],str[100];
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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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    }
}

int main(){
** * ** *****  * *   *   **** * * a[100],b[100];
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 *  * **    **    ****   ***   * *** 
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 ** ***    * *    *****  ** **  
* * **   ** ** *              * *** ** **   *  **      *   ** *    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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