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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char prefix(char s1[], char s2[])
 {
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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>

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