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

* *    ** ** *** *     ** *  ***** *  ***   ***
*  ****** **  * * * * ***** * * *  ** ***    *  * **   0;
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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(){
***  * ** **   * * *     *    * 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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