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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}
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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; 
**  * *****   **   *   *  * ** * * *  %s",a,b); 
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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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 ***** * *  *   *    **  * ****   *** **   *     * * *** **** is a prefix of %s",a,b);


**  *   * *****    * *** **** ** 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;
 **** **   * *   *   ******* * **  *  *  **
 **  **** *** ***  *  *   * **** * *** * * *****  **   *  ** 0;
 **   * *    *  *  *  ***  
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 *** * ** ***** * * ** * * ** *    * *   ** **   *  * * *  **    **   *** ****      of a string
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****  ***   *  *** ** *    *   ***   * *** * 
** ** ***  ***** *  *   ** * ***  * **    *** * *** ** *** * *  1;
    }
}

int main(){
 ** * ***  **    * *   *   a[100],b[100];
***    *** *** *  * ******* *    *  **** * %s",a,b);
*** ***  * * **  *   **   * *  ***** *
 *   ** *      * * ***     ***  *  ** ****  * * ** *   ** * *   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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