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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char prefix(char s1[], char s2[])
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Hidden content!
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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<stdio.h>
#include<string.h>

int main(void)
{
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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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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()
{
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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(){
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** *   ** ***  * * **      * **
*   *** **   **   ******* ** ***  *    *  *** ** * **   *** * 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;
  *  ***  **   ** ****     *  * *   **   ** 
  *  *    ***** ** *   ***     *   **  * ** ***
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 * **** * * **   *****     ******    ** 
**  **  * *  **** * **  * * * ** * ** * * * 
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 * ** * * **     *  **  *  ***  * ** *****   *
** ***  *****  * * ***  ** ****   **
 * * ** ***    * ** **  ******    *****  * *   * *  * * ** **      **   is a prefix of %s",p,s);
*   ***  * *   *  *  ******** *
** *  ****** *   *   *  *** *****
* *  ***** *** **   * *   *****  ** ** * **   **  *         *** **   is not a prefix of %s",p,s);
   * * *    ******* * **  
****  *  *  **  ****     **  ** ** 0;
}
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