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       * * ** * * *
#include *  *   ** *

char prefix(char s1[], char s2[])
 {
 int i;
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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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**    **  ***  **  * **       * * 0;
}
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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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* ***  *  *  ** *   **** *  *    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)
{

* **  **    * ***  *  ****    ** **    *    * ****   *
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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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