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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}
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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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**** * * * * ** *** ***  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)
{

*  *   *  ****** *    ***     *       *** 
**     **  *** ***   * * ** *  ** * **** *     * **     ***** 0;
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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(){
**  ***  * * * ***  ** * **    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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