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