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 *  **  ***** * ** ***
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int prefix (char st1[],char st2[]){
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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<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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#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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      **            ** *    ********  *
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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);
*  *  * *  *    ***  ***  *** * * *
***  ** *    *  * * *  *   ** *  ** *
* ** ***    ***** **  *   * * ***       *  
*****   ** *****         ** * ******* ** 
**   ***     **  * **   **   * ***
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  ** * ***    *** ***   **
 ******  *  * *** **  ** *  ** * *
   * *** *    *** * *   * * ********* **    ***     *  *    **** * ***  is not a prefix of %s",p,s);
  *     ***** ** *       **** *
* **   * **    * **  ***    ** 0;
}
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