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