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[])
 {
 int i;
 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()
{
**   ** ** *    ** *   * ** * a[100];

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* ** **        ***  *** *
}
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Hidden content!
#include * * * **     *   * 
#include ***** ** *** * 

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

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

int main()
{
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 * *   * *** ***   *    **    ** *  *
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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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  *  *****   * ** ***  * **   * ** ** **** 
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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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