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() 
{ 
  *    **    ** **** **    ** * a[100],b[100]; 
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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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 *  ***   * * *  ****   ***    **   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;
** ** *   *    * ** * *       **    ***    
   **  *  ** ****    *  **** **   * ** 
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   *** *  ** ******   *  *  ***** 
* *       *****      *   *****    ** 
 *  ** *** *    ****   *    **   *
**  * *   * ***   * *  * ***   ***  **  ** ***
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***  ***  *****  *   ** **  
* **  *    **  *** ***   * * ** 
 * * *  ***    *** * * *   * * *  * *   * * ** * **   * * * * *  *  *   **** * is not a prefix of %s",p,s);
 *** ** *** * **** ** * *** 
  * *  *   *   * ** *     * ** 0;
}
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