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

int main(void)
{
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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(){
**  * * ** *  *  **   *** * ** 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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