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[])
 {
 int i;
 int length;
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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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*  ***  * **** ** *     * *  *   *  *  0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
*   *   **  ** * *  *   a[100];

     ** **  **  * **  *  b[100];

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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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** **** *   *  *  ** ******  * *  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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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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}

int main()
{
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  * ** ** * **    *     *  ***  * *  *       **   *  **    * ***  *     is not a prefix of %s",pre,str);
*** * ***  *** ** **     * ** * 0;
}
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#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
* **    * * *  * *    ** * c;
******** *  ***       *     * *   *  ** ** **
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    }
}

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