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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}
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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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}

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