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!
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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()
{
    int i,j;
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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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*  ***      ** * * **  * 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()
{
*** *** *  ****   ****   a[100],b[100];
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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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#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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 ** *   * * *** * * * ** * ****
* * * **** *   *  **      **   ****   *  ** * *  **         * ****   *  * 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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