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()
{
**  *        *** *  *  **  * * * a[100];

*  **   *  * *         * * b[100];

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

int main() 
{ 
 *** *** * ***  *  ** **   a[100],b[100]; 
***  ***** ** ***   *  * *** *    i,j,prefix = 1; 
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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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* **    *  *  ** *   *****  **  return 0;


}

int main()
{
**   ***  *  * * ** *    *  *  **   pre[100],str[100];
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**  **  ** ** *     *     ** ** *     ***
  * *  *  **        ***  **  * ***    ****  *  **** * ** *   ** is a prefix of %s",pre,str);
  ** *** *** *** *  ****   
**** **    * *** **** ****     ** *****  ******  *  *    * * 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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 **    **   * *   *  *   * *  *** ** *** *  *    *   ***   ** **  *** *  **** ****    * **   *   *** *    *   ** ** ***  ** 0;
 * *  ***     * *** **      *    *  *** * *  ***** * **  
  **  **  *      * *     * *    * ****    * *** ** *** 1;
    }
}

int main(){
* **   ****  ******      * * * a[100],b[100];
* **  * *  *  *   ***  *   ****  **  * %s",a,b);
*** * ** ***** *   ** * * * * *
 **  *** *  * * **       * * ** **   * *    ***** * ** ** *** *  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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