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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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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    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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  *  *     *  *        *  * *** *  * **   ** *  *  ***     *   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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*  * ***  *   **  ***    ****
 ** *    *** ** ** * ** *****  * *  *  **   **  *  * ** *    ** *  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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