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;
    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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}
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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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0 0
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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    }
}

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