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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#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()
{
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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;
* ****  ** * * * ******* * ***********  **  
 ****  * *    *****  * **  ***  * * *  *  ***   *  ****** 0;
   *    *** * * **  * 
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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);
  * ** ** * **   * ***  * * * * * *  
**  **    * **  *  **   * * *** 
 *  ***     *  * * ***  * ** *  *   *
* ** *****        *** *   *  **   * *** * ***
  *  ** **     ** **** ***** **** * **    * * * *
*** *     *   ** ******* **     **** * *     ***   * ***   * is a prefix of %s",p,s);
   * ** *  **  ** *    *   ****
 * ** **  *  ****   *** *  **
* * * *   **   ** ** * *     * * * **** **** *  *    ** ** ** *    is not a prefix of %s",p,s);
 *    ***   * *  *   *    ** * 
* *** * ***   * *  **  * ***  0;
}
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