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[])
 {
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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()
{
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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 a prefix of %s",pre,str);
 * ****  * *** *  * ***    *    
* ** * *** * *** ****** ** *    ** *  *      *  **  ** ***** 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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  *  *  *  *    * ******    ***  *  *  * *  *  *****
*     **** ***   **  *  ** ** * ******* **** * *  **  ***   ** * 1;
    }
}

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