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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Hidden content!
#include * ***  ****  *
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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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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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}
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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;
  * ** ** * ****** *** ***  * * * ** * 
******  *   ***** ***   ** * ******* **
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* ** *****     *  * ** *    
*  *** **** * *     ******  *  ** *
  ****** ***** ** * **      ** **   *  ** 
* **  *    ** *  ***** *   *    **   *
 *   * **** **** * * ***   * ** **   **
 *  * *    * * * ** *     ** *  **  *  * * * ** *   * * ***     * **  is a prefix of %s",p,s);
 ***  **   ***  **  *  * **  
**** *****  * **   ** **      *
 **  **   **  **** * * *****   **  * * *****   *  *  ** *** *  **  is not a prefix of %s",p,s);
*      ****  **    *      
     * * *  ** ***  ** *  ****   * * 0;
}
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