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