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

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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