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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}
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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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   **** * ** **  *  * * * * *** return 0;


}

int main()
{
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* * *** * * ** ** * **** ****** *
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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];
**    ** * *   ***    *  *     ** * ** ** * * * %s",a,b);
 ****  *** *    *  **  ** ***  *   ****
**  * * ****   *  * * *   *   **** *  ****  **   **** * * **  **** ** *  is a prefix of %s",a,b);
 **  ****** *** **** * *       
*  **  ** **  ******  *  **  ** *  *   **     * *  ******** *  * ***  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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