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()
{
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**  **   ***  *  *** * * * *   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)
{

  *  *   * *  **  * *****  *     ****   * ****  **  **
*    *  * *  **  *   *  * * **   ****** **  **  * *** **   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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 **   *   ** *** *     * ***  *  * ** *  ****  *  *
    ******* *   *  ** *** *** *   * * * *         *     ****   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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