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() 
{ 
   *  **  ***   ***** *   ** a[100],b[100]; 
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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()
{
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* ***** *    **  *    *     ***  * 0;
}
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Hidden content!
#include ** ****   * * * 
#include * *   *      *   

int prefix(const char *pre, const char *str)
{

*   ***    *  **** *      ********* ****       *
 **   * ** *  *  *** * ** *  ** *** * *    **  *  **  0;
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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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***  **** ****   ***    **     * *  *  *  
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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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