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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#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()
{
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    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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** *  ***** ** **  ***  *  *  * *** **         *    * ********  * 1;
    }
}

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