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!
#include *** **** *  * *** 
#include   *      **   ** * *

char prefix(char s1[], char s2[])
 {
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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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*** * * * **      **   ****   0; 
}
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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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*  ***** * ** *  **   *** **  * 
*****     ****  * *** ** **  *** ***   *  *** ***  * * * *     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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*    *    ** **  * *** *   ****       *    ***  ** **    
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    }
}

int main(){
*     **    * ***  * *   *  a[100],b[100];
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****  *   **    * **  * *      
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 * *  ****   * ** *** * *   *****  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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