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()
{
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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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 **  * **  * * *   *  * *  * * * 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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