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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Hidden content!
#include  ***** ** *** *   
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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<stdio.h>
#include<string.h>

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