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