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   *     **  ***

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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*    **    *  *   ***  *  * *   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()
{
* * **   ** *  *  *  * ** *  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)
{

* ***   *****  *   * * *  **  *** *       * ** **** *
** * *** ***** ** *** ** ****  *  **   ** * **  *  *    *   *  0;
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}

int main()
{
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 ***    *    ****  ** **  *
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 ** *  *  *** * *   *   * * ** 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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*  ***** **   * * *  * *   *** ** * *  * * * ** * **  
 *** *    *  *    * **  * *  *     *    *    **  ************ * 1;
    }
}

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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