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

int prefix (char st1[],char st2[]){
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**   * * **   *  *  *   *   0;
}
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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]; 
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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()
{
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**    **** **** * * * * 
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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;
    ****  *  * *  *  *    *   **  * *   * **   ***
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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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