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 *   *    *    

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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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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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***    ***  **  **  *  * ** * 
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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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* *  *  ** *   *  ** * *   **  **** **
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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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