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(){
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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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