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 * ** ***    ***
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int prefix (char st1[],char st2[]){
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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() 
{ 
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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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0 0
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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*    *** *    ********  * ** * return 0;


}

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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