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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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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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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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
**  * * **   **   * *   ***  c;
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    }
}

int main(){
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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);
***  ***  * * * * ***      * ** 
       *** **   * *  * ** ***      *** **
 ****   **    ***    * *    ***  
* ***  * *  ****    * *  *  *  *    * *  *********
*   * * **      *     * **  **      **  *    
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**** * ** ****    ********   ***
* ****  * *  *    *** * ****   **  
**** *  * * **********  * **    * * *  **** *****  * ** ***     **  is not a prefix of %s",p,s);
**  **   * ********* * **
 *  *  ** *****   ***  ***  *  0;
}
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