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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#include ** * **** *    

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

int perfix(char *a,char *b){
*   *** ***  ***  * *  *  c;
***    ** **  ****** ***** * *   ** * *   *  **  ** 
 *** *   *  **   ** * ***  ***   **  ** ** ** *  **    * *    0;
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 **  * * *   * *     *        **  ***** * * ** * *  * *  *  ***** ****  * **   * ***  ***  **
  ***  *******   * *   * *  ****  *** **** *  *   **  ***     **      ***  ***  * *      **     *  0;
*  **    **    *     * * * *    ****   **   ****  *  *
** ***  ****  * ***   **   **    *  * **    ** ***   ** * *  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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