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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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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   * * ****   * ***     *
}
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Hidden content!
#include * *  *****  *  
#include  ****  ** **   *  

int main() 
{ 
*** **   ***  **   *    ****     a[100],b[100]; 
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*  *** *    *   * *   ** = 0 ; i < len ; i++) 
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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)
{

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


}

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