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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char prefix(char s1[], char s2[])
 {
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Hidden content!
#include ** ** ****** * **
#include  *   *  * ***  * 

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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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0 0
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;
****   * ** * **** *       *** *   *  * ***** * *
** ****** **   ** *  *** * *  ****** ** ** * * ** ** **  **   * 0;
***   * * **           *
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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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