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!
#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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*   *  * * *   *  ***  *  ****** 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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*** * ***  *  ** **  * ** * 
 *****  * *    * *  *          *  *** ***  *    ** *     is not a prefix of %s",pre,str);
 * ***   ****  **  * **  *  **  0;
}
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#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
**    **    *** * *** *** * ***     c;
 ** *  **** *   *  *      * *    *  *    ***   *
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    }
}

int main(){
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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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