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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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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** *  *        *   *  **  * 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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     *    * *  *       * **    * *   * * **      ***  ** *   ***  ***  ******** of a string
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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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