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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char prefix(char s1[], char s2[])
 {
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 int length;
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Hidden content!
#include * * ******* * * 
#include *  ** ** *** ** 

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;
    char a[100], b[100];
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
    char pre[100], str[100];
    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() 
{ 
*   * *  *** * ***  *  * *   * *  a[100],b[100]; 
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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()
{
  ** **  ** * ***  * **** * **** 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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** ** * * ***  * * ** ***  *  *   *    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);
* * **  ***** * ***  ***** * *  *    **
****** * *    **  * * ** * *** *   *
   *  * ****    * ** ***  **  *** ****  
 ** ***   ** ***  ***** ******* ****  **   * * 
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 *  ******* ** **        *********  *      **** **** * * **  * * is a prefix of %s",p,s);
  ***   * * * ** ***   ***  
  **  *   *  *** **   *   *    
     ****** **  **    * * **   *** *    * *   * ****    *  ** is not a prefix of %s",p,s);
*** *  * * *  *  *   * * * *  **
 **  * * * ****    *** *    ** 0;
}
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