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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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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 **      * *  * **       *    len = strlen(a);
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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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   * *** *   *   * * * *   ** **
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*** ** ** *   ***  ** *   ***  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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