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 * ** * * *   ***
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char prefix(char s1[], char s2[])
 {
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Hidden content!
#include    ** ** * *  *   
#include *   *  ***** ** *

int prefix (char st1[],char st2[]){
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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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0 0
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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      *  *  *     *****  **  *  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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*   **** *   **  * * * **   *   ****
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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];
 *      *  *** *  **    *   *     ****    * %s",a,b);
 *****  *  **  ** *  *    **   **   
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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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