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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 {
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Hidden content!
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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)
{
    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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}
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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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**** * ***   **** **  *** *** return 0;


}

int main()
{
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   * ** *** **  *     ** ***  ******
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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(){
*    * ***   ** ***   * * **  * a[100],b[100];
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 ** ***  * * *  *   **** *    *** *  * 
  *   ** ** *  **  * *  ** **********   *  ***    **   *        is a prefix of %s",a,b);
* **  *   *** *   *  *** *
 *** **     ***     *        * * * * * *    ****** ***** * **    * 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);
*****    * * *  **     **  *   
  *  ** ****  *  *   *** ** *** *
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*  *    ** * *    * ***  * *  **  * *  *
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***** *** **    ***    **  *  * *** **   * **** *******  * **     is a prefix of %s",p,s);
 *    **  * *   * ***   * *  *
 * *  *  *        *** **  *** *
  *    ***  *   *        *  ** * *  * * ** * ** *      * * *   *** **  * is not a prefix of %s",p,s);
 ***  *  * * *    *   **** ** *
* *  * *** *  **     ******     * 0;
}
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