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[])
 {
 int i;
 int length;
 int count=0;
 
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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];
   ** *  * *** *  *     ****  i,j,prefix = 1;
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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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  *****   * *  * ***** ***    * *   ****     ** ******
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****     *  * *  * **      *  ****  return 0;


}

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