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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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)
{

 ** **** ****   ** ***  * * * *** **  *     *  * **   *
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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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  * *  ***    *  *   *  *   **** *** *    ** ****
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    }
}

int main(){
****  *    **  *  * ***  ***  *  a[100],b[100];
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 **** **** ****  *  * *  ** *  * **  *
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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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