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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#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()
{
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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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Hidden content!
#include <stdio.h>
#include <string.h>

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

int main(){
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* * *   * ****  *** ****** 
 *    ***  *       ****  ** **  ***  * ** ** *** ***  *  **  **  *  ** ** ** is a prefix of %s",a,b);
** * **    ** **  *   *    *  
*  *  *  ** ** ** * *     **** ***** ** * * * ****   *** * * **  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);
  * ** *** *   *   *   **  * * *  *
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**** **  **     * *          ***
*** *   ***   * *   ****** *  ****  * *  * **   ****  **
* * **  ***** ****  ***  *  *  **    *** * *
*  * * *   **    ** *******  * *   **  * *    ** ** * *  ** * *** is a prefix of %s",p,s);
 * *  *   * ******* ***  ** 
 * *** **   * ******  *   *  
 * ***       ****    ***** *  * ***   ** *** ** * * **  * ***      is not a prefix of %s",p,s);
***   *** *    *  * * **** ** 
   *   ***** * **    * *     0;
}
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