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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#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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}
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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(){
 ** *  * ****  ***  *****  a[100],b[100];
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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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