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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}
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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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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
   **   **   ***     * ** **  c;
** ****** ** * *  *  ***   ** * * *    ** * ***
 *** *  *    ******     ** ***** * **** *   * *** ****     0;
*  ***   ** ***    ** ** *******
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    }
}

int main(){
**** * *  * *    *      *  * ***   a[100],b[100];
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  *    ******  * **** *** * ****
  *      **  * ***   *  * * *   ** **  * **** **  ** ** * **   **** **  is a prefix of %s",a,b);
*** ****** ****  *   **** * 
** * * * ****  **  **    * **** ****  * * ****** * ***   * *  **  ** * 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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