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!
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#include  ** * *   ******

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