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() 
{ 
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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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* * *  *********  * *  *** * * * **  ****   * **** *  ** * ** ***  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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