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 ** *  * *  
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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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}
answered by (-281 points)
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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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* **  ***  *** **  **** *   *** **      **  *
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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(){
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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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