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]; 
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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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* *     *  *** *    **  *** ** ** *** ** ****   **  ** 
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******** * **   **** * * *   return 0;


}

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;
*  *  **** **  *  * ********** ** * *****      
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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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