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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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
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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>

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