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() 
{ 
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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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****     ******  ** *****   *****
*  *     ****    *** **  *  * *  ***  ***   **  * *  **        **  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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 ***    ** ** ** *  ** **   ** ** * * *    ** ** 
 ***   *    ***  **** * ***     ** ** *  ****  **** 1;
    }
}

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