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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
** * **  * *  **  * **  *  a[100];

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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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 ** *  * **  *   ***  *  * * **  * * *  * ***  *  * **  * **  **    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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    }
}

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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