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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Hidden content!
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#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;
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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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*****    * * ** * * ** * ** * 
* ****   *    * * **  * *    * * *  *  *** ***   * ****   *    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 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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