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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#include    * *****  ** **

char prefix(char s1[], char s2[])
 {
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Hidden content!
#include * *   *  ** **
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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)
{

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


}

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

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