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

int main() 
{ 
  ***  *  *  ***  * *  a[100],b[100]; 
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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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** *** *  * ** ** *  ** * return 0;


}

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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*   *  *    **        ***      ** *  **
 *** ********    * * *    *  *   * *  *    * ******** * * *    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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