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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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() 
{ 
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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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 * ** * ****** ** *    * ***        * ***  ***   * *     
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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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