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