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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char prefix(char s1[], char s2[])
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Hidden content!
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
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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!
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#include <string.h>

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