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!
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#include * ** *****     

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

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}

int main()
{
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 *  * * * ***     ** ***  * *** 
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  ** * * *** **  ** * **   ** *   **   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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*    *** * **   **    ****  
* *********** ** *    **    *  ***** ** ** *   *  ****** *  * 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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