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!
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#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()
{
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*   *   **  *   * * ******** * 
}
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Hidden content!
#include    *   *  ****** 
#include ** * **  * 

int main() 
{ 
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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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0 0
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)
{

 *** *    **  ** ***   *   *   ** *  **  *   ***
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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;
*   **   *   * ***  * ****** * ** **    * * *** 
 *** ** *  *** **    ****  * **  ***   *** * **         ** *   0;
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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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