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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#include *  ******    ** **

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

int main()
{
    int i,j;
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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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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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 **  * ************* *  
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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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    }
}

int main(){
    *** *   ***  ** * *     *  a[100],b[100];
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** * ***  ** *** *   **  *   *    * *** ** ** 
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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);
 **   *** * *** ** *      *  
  *  * * * ** ** * **  **  ***    ** ******** *
*** ******  ***   * **   **** *  ******* 
*  *  * *** **  * *  ***** * *            ***
 * ***** *   *  *** **    * *  *** **  * * **
**      * ** ** **     * *** * ** *** *  *   *** ** **** * *     ***   is a prefix of %s",p,s);
** * **  * ** * ****  * ** 
 **   *    ** ******     * * *
****  * *   *    *   **  ***** ** *  **  *   **  *    **     *   *  is not a prefix of %s",p,s);
*   ***   ***  ******   
      * ***  *   *  *    * * **  **  0;
}
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