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() 
{ 
** ** *** ** * ** * **   ** *     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)
{

** * *****  *                * * **  * ** *    *** ****
* ** *** ****** ***    ***    * *  *** *      **  ** 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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   ***  *** ****** *  ***    * 
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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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