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!
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}
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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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    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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}
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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(){
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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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