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

int main()
{
    int i,j;
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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() 
{ 
***   * ** * **          * * * a[100],b[100]; 
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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;
*** **  *     * ***** *    ** ***  *   *
 *    *****   * * **  *  *** ****** 
* * *   **  ** * **     *** *   *   ** *   %s",p,s);
 * * ***** **    ** * **  **    * *   
  *  * ** ***** **  **  * * *   
 * **  *** * ***    ***** * **** ***  *  **
*** *   ** **  ** * ** **  * *    * *  ***    
****  *   *     * ** ** *  ** *   ***
**** **** **** * ** *    *   * ** * *  * **** **** *  *    **     is a prefix of %s",p,s);
**  * * ********* **  *  * 
* * *  *  *  ***  ***   ** *   
*** *   *  *  *  *  * *  ******* ******** **  ** *  * ****   **   ***   is not a prefix of %s",p,s);
** *   *****  * ***  * **   
****  ****** *** ** * *     0;
}
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