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