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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 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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 * ***     **** **       ** ******* * ** *  *** * **    *** **   ** is a prefix of %s",a,b);


*  *** * *** *  * * ****  *** 0;
}
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Hidden content!
#include *  *        * 
#include     **   ***

int prefix(const char *pre, const char *str)
{

 * ***        *****    **  *  * **** **    * *** **
  * ***   * * *  **  *   **     *** *  ****    *  ** ****** * * 0;
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   *   *    * *  ** * ***  ******  return 0;


}

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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 **   ** ****      ***  
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* * *   ** * *  *    ****  ****** * *  *  *  ****   
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    }
}

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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