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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 int length;
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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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}
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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)
{

**  **** *  ** **  ***** *    *   * *** *    ****  *
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*** * *   ***  **** **  *   * return 0;


}

int main()
{
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***  ** **   * **   ***   
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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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**  ** ** *      **  *****
 **  * *  * *   * ***  * ***
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* **** *****    *   *  *    * ***        ***    **     ****
   *     *  ** **  **   ***** ***     ** * * ** * ** ****      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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