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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 int length;
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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]; 
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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()
{
**   *** *  ***  ** ****  **** a[100],b[100];
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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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**  ***      *     *  * ** * * *** return 0;


}

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