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!
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#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)
{
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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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 ***   * *** * *** *** *  ** **  *     *** **  **  *
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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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