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 ***  * ****** 
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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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***   **** ***  ** *  ******* ** 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)
{

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