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()
{
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    char a[100], b[100];
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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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 ****  **   *  **     * **  * * * len = strlen(a);
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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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