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!
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
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    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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}
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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()
{
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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()
{
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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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    }
}

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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