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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}
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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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*   ** ***    *** **  **  **   * **   *  * ** **  * *         * ** *   ** ******   *  *   ***

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

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