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()
{
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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()
{
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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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 *   * ** * *       *  * *  *
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** *  *** ** *  * ***  ***  *  *  *** * ** ** * *** *
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    }
}

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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