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>

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