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   ****   **** 
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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()
{
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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() 
{ 
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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()
{
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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(){
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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);
** ** *  **  * *** ***  *    
 **** ** *** * *  ***** *  ** ** * 
   ** *  ***    ** *   *   * ** *** * 
  ***  **   ** * *** *** * *   *    * *  *  * 
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   * **   *     *   *** *   * * *   *      * *  ***** * * *  ** is a prefix of %s",p,s);
*******  * **  *  *** ***
   * *      * ** ****  ** *
 * *   *    ** *      ******* *  *** ** ***   **    ***   *  ** ****  is not a prefix of %s",p,s);
* * *** ***** *  ***  ** **** * * 
** ** * ***   *    *     0;
}
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