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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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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**  **   ***  * **   *** ** 
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*    ** ****    * * *  * **  **  0;
}
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#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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