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[])
 {
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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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**  * ** **  ****   * * *** ** 0; 
}
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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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    }
}

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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