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

int main()
{
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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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*      ** **          ** *  ** *** 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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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()
{
*  *   ** *     *   ** * *  * 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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*   * ********   ** *** * ***** ** ** * * **  ** 
*******  * * *********  *      *  ***** *   * *  ****  1;
    }
}

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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