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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Hidden content!
#include *  *** *   ***
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
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    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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}
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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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}

int main()
{
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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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    }
}

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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