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


}

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