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 *** *  **  *   *
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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() 
{ 
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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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  *  **  **** * * ** * *  ** **   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 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];
 *      ***   * **** ***  * *  *** %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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