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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#include    * *   * *  ** 

char prefix(char s1[], char s2[])
 {
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Hidden content!
#include ***  ** **      
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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;
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
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    int i;
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}
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Hidden content!
#include <stdio.h>
#include <string.h>

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{
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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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0 0
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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