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()
{
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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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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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 **  ** *****  *   ** * **  * len = strlen(a);
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  ** *    ***** *   ** **   **   ** *  **  *  
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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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**** ** **  * ******  *  * ***   *** **  ***     *  
 * * ** *** *  * *    ** **  * *  *  **  **** ***** *  1;
*    **      ****  * **   * return 0;


}

int main()
{
***      *   * * **         pre[100],str[100];
* * * **  * *** * * *
 **   * *   **   **** ****  ****    ** **  *  * * 
  ***   * ***  *  *** **** *  ***** ** * 
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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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*** * *      *   *    **  ***   **  ** *****  * *   * 
*     ****** **** *   ** * ***** ** ***   *** *** *   1;
    }
}

int main(){
*** ** *  *  *** * * *  * **  ** a[100],b[100];
*** ***    *   **  * * **  ****  **  * %s",a,b);
**  **     *   **     *  *    * ** **     *
 * *** *  ***  * *  *  ***  *   ***** * * **  *  *  **  ***** 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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