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 *     ****  *  * **
#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()
{
    int i,j;
    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(){
*       * * **    *** **    **  * a[100],b[100];
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 ** * * * * ** * * *** **** * ****  ****
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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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