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  ** *  *  ***
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char prefix(char s1[], char s2[])
 {
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Hidden content!
#include * *  **   *** 
#include *     *  ***

int prefix (char st1[],char st2[]){
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
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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()
{
 *    **     * ***** ** 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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 *  * * *  *  ** *   ***     *** * *   *  * **   *** *** **
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    }
}

int main(){
*****  *  **   ** *****  *  * a[100],b[100];
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 * ** *  * ***  *  * **  ***   *
 ** * *   ***** *** ** *********  *** * *   **   ***   * * ************ is a prefix of %s",a,b);
* * * *   * * **   *  *   *    
   * **   ***** *  ** * ** *   ***  * *  *  *  ** *** **   *** **  * 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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