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


}

int main()
{
      *   *   * ******** * *    pre[100],str[100];
* * *** *     *  
       *     ****    *  * *** *      *   *** ** ***** 
*** ****  ***   ********** * ***  ** ***
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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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 ********   **  *** **     **  *  ****      * *  **** *** **** *   ***** ** of a string
   *  *  ** *  **     * * * *****  ** **** **   *   * *  **   ***  *  **   **   *****
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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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