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()
{
    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() 
{ 
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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;
    *** * *  * *   ** **  **  *  * *    * *
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 **  * *  **  *  ***   ***   * * %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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