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

int prefix (char st1[],char st2[]){
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
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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() 
{ 
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* **  * ** * *  * ****   ** 0; 
}
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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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 **  ****     *  * **   *** **   *** *  **  *  * ** *
 ** *   *      * *   **** * * *** ** *  **        * ** *  1;
    }
}

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