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()
{
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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);
* ***    **  * * *  ******        *** 
  **     * *** *   *      * * * * 
* *** * * ** **    **  ***** ****  * 
*** *    * ** **       * *  * *   **  *
 *     **   ** **** ** ** ** *** * * *    ** *
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*   ** * *** **   * *  ***  
*********  *    *  * * ***  *     
 *  * ***** * *  ******  **  **  * *  *** * * *  ***  ** **  *** * *  is not a prefix of %s",p,s);
   * *  *** * **  *
*****  *  **   *** * * ** * * ** *  *** 0;
}
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