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() 
{ 
 ***  *** **   ** **** *  a[100],b[100]; 
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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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*    **** * ****** ** *   *  *  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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*   * ** ******     * *** **   ***** ****  *** *  *  ***
* * * * **     * ** ****  **  *  *    *****  *   *******  *   * 1;
    }
}

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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