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!
#include  **** ****  ***  **
#include *** *  *   **  

int prefix (char st1[],char st2[]){
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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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}
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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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    }
}

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;
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 ***    *  * *     *  *****    ** ** 
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* * **  ** ****   * * * ***  **     *  
** ** * **** *  *****  *****  *  * **
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 * ** ** *   ***  **        * *** *   ** * *  * * 
*  ** * *  **      *  * * **  * * *  *
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 ** ********  ****  ****   * 
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*****   **     *** ** *  * **  *** * *   * * **    *  ** *  * **   ** *   is not a prefix of %s",p,s);
*** *   *  * * * **** 
     * **        *** **  *  **  0;
}
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