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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     ***** ** ***  *  * ** ** 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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****  * *      * *    ***  ** 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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 * *     *    ** **      * * * * len = strlen(a);
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*** ** * *   ** ******     * *** * * *   *     * * **    ***   ** * *   *  ** **  **   *   **  *** *   is not a prefix of %s",a,b);
 ***  ** ** **** *    * *    ******  ***  *  ***    *** ** * * **   *    *** * * * ** *  
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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)
{

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


}

int main()
{
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   * *  *   ****** ** 
*** * *   **  **** *     ****  * *    * *** *
** ** ** * *  * **  *** **  * *      *  * * ** ***
 **      *   ***  **    *   * * ** *   *   * **   *     ** * ****    *  * is a prefix of %s",pre,str);
* *  *  * *  **    * * ** * **
* ** **  ** ** *** * *    * **  ****     *   * ***  *  *   * * * 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;
*  * **  *   **** ** ***
  * **   ** ****   *** ***   
    * **  * *     ******** ** *   * ******  *******   **   ***    *   **  * **** 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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