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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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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}
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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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}

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 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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