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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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)
{
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    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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}
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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()
{
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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;
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    }
}

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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