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[])
 {
 int i;
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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() 
{ 
   * *  **   *  ****** * *** a[100],b[100]; 
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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)
{

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

int main()
{
* **    *    ** * * *  **** pre[100],str[100];
  *****   *    **  **    
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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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