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!
#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() 
{ 
    * *  * *** *** **** *  *  a[100],b[100]; 
*  **        *** *  * **  * * i,j,prefix = 1; 
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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(){
*    *  *** *** ****** **** * 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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