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  **** ** * * **** 
#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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* *** ***       ****  * **  * b[100];

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  **  *   **     *** ***  *  
}
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Hidden content!
#include  * *   ****  * **  
#include  *******      * * 

int main() 
{ 
*** *  **     * * * **   *** *** a[100],b[100]; 
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* *  * *  **** *   * **** ***** ** 0; 
}
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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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 **  * *    * ** * ****   **  *  **** *** * **    *** ***     * is a prefix of %s",a,b);


*** * **** *  *** * * *** * 0;
}
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Hidden content!
#include **  *   **     * 
#include  **** *  *****   

int prefix(const char *pre, const char *str)
{

  *    **   *  *  **** ** *   *  ** ********* 
*  **  * ******  *  *   ***** *** ***  *  * * ** *  * *    ***   0;
***  ********  * * ***** *    *    ****  ** *** * *
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****  *  *   *  *** ******* *  *** return 0;


}

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