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

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